Loading doc/fix_thermal_conductivity.html +19 −11 Original line number Original line Diff line number Diff line Loading @@ -23,7 +23,7 @@ <LI>edim = <I>x</I> or <I>y</I> or <I>z</I> = direction of kinetic energy transfer <LI>edim = <I>x</I> or <I>y</I> or <I>z</I> = direction of kinetic energy transfer <LI>Nbin = # of layers in edim direction <LI>Nbin = # of layers in edim direction (must be even number) <LI>zero or more keyword/value pairs may be appended <LI>zero or more keyword/value pairs may be appended Loading Loading @@ -53,16 +53,17 @@ Muller-Plathe method, the heat flux is imposed, and the temperature gradient is the system's response. gradient is the system's response. </P> </P> <P>The simulation box is divided into <I>Nbin</I> layers in the <I>edim</I> <P>The simulation box is divided into <I>Nbin</I> layers in the <I>edim</I> direction. Every N steps, Nswap pairs of atoms are chosen in the direction, where the layer 1 is at the low end of that dimension and following manner. Only atoms in the fix group are considered. The the layer <I>Nbin</I> is at the high end. Every N steps, Nswap pairs of hottest Nswap atoms in the bottom layer are selected. Similarly, the atoms are chosen in the following manner. Only atoms in the fix group coldest Nswap atoms in the middle later are selected. The two sets of are considered. The hottest Nswap atoms in layer 1 are selected. Nswap atoms are paired up and their velocities are exchanged. This Similarly, the coldest Nswap atoms in the "middle" layer (see below) effectively swaps their kinetic energies, assuming their masses are are selected. The two sets of Nswap atoms are paired up and their the same. Over time, this induces a temperature gradient in the velocities are exchanged. This effectively swaps their kinetic system which can be measured using commands such as the following, energies, assuming their masses are the same. Over time, this induces which writes the temperature profile (assuming z = edim) to the file a temperature gradient in the system which can be measured using tmp.profile: commands such as the following, which writes the temperature profile (assuming z = edim) to the file tmp.profile: </P> </P> <PRE>compute ke all ke/atom <PRE>compute ke all ke/atom variable temp atom c_ke<B></B>/1.5 variable temp atom c_ke<B></B>/1.5 Loading @@ -75,6 +76,13 @@ conjunction with the swap rate N, allows the heat flux to be adjusted across a wide range of values, and the kinetic energy to be exchanged across a wide range of values, and the kinetic energy to be exchanged in large chunks or more smoothly. in large chunks or more smoothly. </P> </P> <P>The "middle" layer for velocity swapping is defined as the <I>Nbin</I>/2 + 1 layer. Thus if <I>Nbin</I> = 20, the two swapping layers are 1 and 11. This should lead to a symmetric temperature profile since the two layers are separated by the same distance in both directions in a periodic sense. This is why <I>Nbin</I> is restricted to being an even number. </P> <P>As described below, the total kinetic energy transferred by these <P>As described below, the total kinetic energy transferred by these swaps is computed by the fix and can be output. Dividing this swaps is computed by the fix and can be output. Dividing this quantity by time and the cross-sectional area of the simulation box quantity by time and the cross-sectional area of the simulation box Loading doc/fix_thermal_conductivity.txt +19 −11 Original line number Original line Diff line number Diff line Loading @@ -16,7 +16,7 @@ ID, group-ID are documented in "fix"_fix.html command :ulb,l thermal/conductivity = style name of this fix command :l thermal/conductivity = style name of this fix command :l N = perform kinetic energy exchange every N steps :l N = perform kinetic energy exchange every N steps :l edim = {x} or {y} or {z} = direction of kinetic energy transfer :l edim = {x} or {y} or {z} = direction of kinetic energy transfer :l Nbin = # of layers in edim direction :l Nbin = # of layers in edim direction (must be even number) :l zero or more keyword/value pairs may be appended :l zero or more keyword/value pairs may be appended :l keyword = {swap} :l keyword = {swap} :l Loading @@ -43,16 +43,17 @@ Muller-Plathe method, the heat flux is imposed, and the temperature gradient is the system's response. gradient is the system's response. The simulation box is divided into {Nbin} layers in the {edim} The simulation box is divided into {Nbin} layers in the {edim} direction. Every N steps, Nswap pairs of atoms are chosen in the direction, where the layer 1 is at the low end of that dimension and following manner. Only atoms in the fix group are considered. The the layer {Nbin} is at the high end. Every N steps, Nswap pairs of hottest Nswap atoms in the bottom layer are selected. Similarly, the atoms are chosen in the following manner. Only atoms in the fix group coldest Nswap atoms in the middle later are selected. The two sets of are considered. The hottest Nswap atoms in layer 1 are selected. Nswap atoms are paired up and their velocities are exchanged. This Similarly, the coldest Nswap atoms in the "middle" layer (see below) effectively swaps their kinetic energies, assuming their masses are are selected. The two sets of Nswap atoms are paired up and their the same. Over time, this induces a temperature gradient in the velocities are exchanged. This effectively swaps their kinetic system which can be measured using commands such as the following, energies, assuming their masses are the same. Over time, this induces which writes the temperature profile (assuming z = edim) to the file a temperature gradient in the system which can be measured using tmp.profile: commands such as the following, which writes the temperature profile (assuming z = edim) to the file tmp.profile: compute ke all ke/atom compute ke all ke/atom variable temp atom c_ke[]/1.5 variable temp atom c_ke[]/1.5 Loading @@ -65,6 +66,13 @@ conjunction with the swap rate N, allows the heat flux to be adjusted across a wide range of values, and the kinetic energy to be exchanged across a wide range of values, and the kinetic energy to be exchanged in large chunks or more smoothly. in large chunks or more smoothly. The "middle" layer for velocity swapping is defined as the {Nbin}/2 + 1 layer. Thus if {Nbin} = 20, the two swapping layers are 1 and 11. This should lead to a symmetric temperature profile since the two layers are separated by the same distance in both directions in a periodic sense. This is why {Nbin} is restricted to being an even number. As described below, the total kinetic energy transferred by these As described below, the total kinetic energy transferred by these swaps is computed by the fix and can be output. Dividing this swaps is computed by the fix and can be output. Dividing this quantity by time and the cross-sectional area of the simulation box quantity by time and the cross-sectional area of the simulation box Loading doc/fix_viscosity.html +20 −13 Original line number Original line Diff line number Diff line Loading @@ -25,7 +25,7 @@ <LI>pdim = <I>x</I> or <I>y</I> or <I>z</I> = direction of momentum transfer <LI>pdim = <I>x</I> or <I>y</I> or <I>z</I> = direction of momentum transfer <LI>Nbin = # of layers in pdim direction <LI>Nbin = # of layers in pdim direction (must be even number) <LI>zero or more keyword/value pairs may be appended <LI>zero or more keyword/value pairs may be appended Loading Loading @@ -57,18 +57,19 @@ momentum flux is imposed, and the shear velocity profile is the system's response. system's response. </P> </P> <P>The simulation box is divided into <I>Nbin</I> layers in the <I>pdim</I> <P>The simulation box is divided into <I>Nbin</I> layers in the <I>pdim</I> direction. Every N steps, Nswap pairs of atoms are chosen in the direction, where the layer 1 is at the low end of that dimension and following manner. Only atoms in the fix group are considered. Nswap the layer <I>Nbin</I> is at the high end. Every N steps, Nswap pairs of atoms in the bottom layer with positive velocity components in the atoms are chosen in the following manner. Only atoms in the fix group <I>vdim</I> direction closest to the target value <I>V</I> are selected. are considered. Nswap atoms in layer 1 with positive velocity Similarly, Nswap atoms in the middle later with negative velocity components in the <I>vdim</I> direction closest to the target value <I>V</I> are components in the <I>vdim</I> direction closest to the negative of the selected. Similarly, Nswap atoms in the "middle" layer (see below) with target value <I>V</I> are selected. The two sets of Nswap atoms are paired negative velocity components in the <I>vdim</I> direction closest to the up and their <I>vdim</I> momenta components are swapped within each pair. negative of the target value <I>V</I> are selected. The two sets of Nswap This resets their velocities, typically in opposite directions. Over atoms are paired up and their <I>vdim</I> momenta components are swapped time, this induces a shear velocity profile in the system which can be within each pair. This resets their velocities, typically in opposite measured using commands such as the following, which writes the directions. Over time, this induces a shear velocity profile in the profile to the file tmp.profile: system which can be measured using commands such as the following, which writes the profile to the file tmp.profile: </P> </P> <PRE>fix f1 all ave/spatial 100 10 1000 z lower 0.05 vx & <PRE>fix f1 all ave/spatial 100 10 1000 z lower 0.05 vx & file tmp.profile units reduced file tmp.profile units reduced Loading @@ -81,6 +82,12 @@ conjunction with the swap rate N, allows the momentum flux rate to be adjusted across a wide range of values, and the momenta to be adjusted across a wide range of values, and the momenta to be exchanged in large chunks or more smoothly. exchanged in large chunks or more smoothly. </P> </P> <P>The "middle" layer for momenta swapping is defined as the <I>Nbin</I>/2 + 1 layer. Thus if <I>Nbin</I> = 20, the two swapping layers are 1 and 11. This should lead to a symmetric velocity profile since the two layers are separated by the same distance in both directions in a periodic sense. This is why <I>Nbin</I> is restricted to being an even number. </P> <P>As described below, the total momentum transferred by these velocity <P>As described below, the total momentum transferred by these velocity swaps is computed by the fix and can be output. Dividing this swaps is computed by the fix and can be output. Dividing this quantity by time and the cross-sectional area of the simulation box quantity by time and the cross-sectional area of the simulation box Loading doc/fix_viscosity.txt +20 −13 Original line number Original line Diff line number Diff line Loading @@ -17,7 +17,7 @@ viscosity = style name of this fix command :l N = perform momentum exchange every N steps :l N = perform momentum exchange every N steps :l vdim = {x} or {y} or {z} = which momentum component to exchange :l vdim = {x} or {y} or {z} = which momentum component to exchange :l pdim = {x} or {y} or {z} = direction of momentum transfer :l pdim = {x} or {y} or {z} = direction of momentum transfer :l Nbin = # of layers in pdim direction :l Nbin = # of layers in pdim direction (must be even number) :l zero or more keyword/value pairs may be appended :l zero or more keyword/value pairs may be appended :l keyword = {swap} or {target} :l keyword = {swap} or {target} :l Loading Loading @@ -46,18 +46,19 @@ momentum flux is imposed, and the shear velocity profile is the system's response. system's response. The simulation box is divided into {Nbin} layers in the {pdim} The simulation box is divided into {Nbin} layers in the {pdim} direction. Every N steps, Nswap pairs of atoms are chosen in the direction, where the layer 1 is at the low end of that dimension and following manner. Only atoms in the fix group are considered. Nswap the layer {Nbin} is at the high end. Every N steps, Nswap pairs of atoms in the bottom layer with positive velocity components in the atoms are chosen in the following manner. Only atoms in the fix group {vdim} direction closest to the target value {V} are selected. are considered. Nswap atoms in layer 1 with positive velocity Similarly, Nswap atoms in the middle later with negative velocity components in the {vdim} direction closest to the target value {V} are components in the {vdim} direction closest to the negative of the selected. Similarly, Nswap atoms in the "middle" layer (see below) with target value {V} are selected. The two sets of Nswap atoms are paired negative velocity components in the {vdim} direction closest to the up and their {vdim} momenta components are swapped within each pair. negative of the target value {V} are selected. The two sets of Nswap This resets their velocities, typically in opposite directions. Over atoms are paired up and their {vdim} momenta components are swapped time, this induces a shear velocity profile in the system which can be within each pair. This resets their velocities, typically in opposite measured using commands such as the following, which writes the directions. Over time, this induces a shear velocity profile in the profile to the file tmp.profile: system which can be measured using commands such as the following, which writes the profile to the file tmp.profile: fix f1 all ave/spatial 100 10 1000 z lower 0.05 vx & fix f1 all ave/spatial 100 10 1000 z lower 0.05 vx & file tmp.profile units reduced :pre file tmp.profile units reduced :pre Loading @@ -70,6 +71,12 @@ conjunction with the swap rate N, allows the momentum flux rate to be adjusted across a wide range of values, and the momenta to be adjusted across a wide range of values, and the momenta to be exchanged in large chunks or more smoothly. exchanged in large chunks or more smoothly. The "middle" layer for momenta swapping is defined as the {Nbin}/2 + 1 layer. Thus if {Nbin} = 20, the two swapping layers are 1 and 11. This should lead to a symmetric velocity profile since the two layers are separated by the same distance in both directions in a periodic sense. This is why {Nbin} is restricted to being an even number. As described below, the total momentum transferred by these velocity As described below, the total momentum transferred by these velocity swaps is computed by the fix and can be output. Dividing this swaps is computed by the fix and can be output. Dividing this quantity by time and the cross-sectional area of the simulation box quantity by time and the cross-sectional area of the simulation box Loading Loading
doc/fix_thermal_conductivity.html +19 −11 Original line number Original line Diff line number Diff line Loading @@ -23,7 +23,7 @@ <LI>edim = <I>x</I> or <I>y</I> or <I>z</I> = direction of kinetic energy transfer <LI>edim = <I>x</I> or <I>y</I> or <I>z</I> = direction of kinetic energy transfer <LI>Nbin = # of layers in edim direction <LI>Nbin = # of layers in edim direction (must be even number) <LI>zero or more keyword/value pairs may be appended <LI>zero or more keyword/value pairs may be appended Loading Loading @@ -53,16 +53,17 @@ Muller-Plathe method, the heat flux is imposed, and the temperature gradient is the system's response. gradient is the system's response. </P> </P> <P>The simulation box is divided into <I>Nbin</I> layers in the <I>edim</I> <P>The simulation box is divided into <I>Nbin</I> layers in the <I>edim</I> direction. Every N steps, Nswap pairs of atoms are chosen in the direction, where the layer 1 is at the low end of that dimension and following manner. Only atoms in the fix group are considered. The the layer <I>Nbin</I> is at the high end. Every N steps, Nswap pairs of hottest Nswap atoms in the bottom layer are selected. Similarly, the atoms are chosen in the following manner. Only atoms in the fix group coldest Nswap atoms in the middle later are selected. The two sets of are considered. The hottest Nswap atoms in layer 1 are selected. Nswap atoms are paired up and their velocities are exchanged. This Similarly, the coldest Nswap atoms in the "middle" layer (see below) effectively swaps their kinetic energies, assuming their masses are are selected. The two sets of Nswap atoms are paired up and their the same. Over time, this induces a temperature gradient in the velocities are exchanged. This effectively swaps their kinetic system which can be measured using commands such as the following, energies, assuming their masses are the same. Over time, this induces which writes the temperature profile (assuming z = edim) to the file a temperature gradient in the system which can be measured using tmp.profile: commands such as the following, which writes the temperature profile (assuming z = edim) to the file tmp.profile: </P> </P> <PRE>compute ke all ke/atom <PRE>compute ke all ke/atom variable temp atom c_ke<B></B>/1.5 variable temp atom c_ke<B></B>/1.5 Loading @@ -75,6 +76,13 @@ conjunction with the swap rate N, allows the heat flux to be adjusted across a wide range of values, and the kinetic energy to be exchanged across a wide range of values, and the kinetic energy to be exchanged in large chunks or more smoothly. in large chunks or more smoothly. </P> </P> <P>The "middle" layer for velocity swapping is defined as the <I>Nbin</I>/2 + 1 layer. Thus if <I>Nbin</I> = 20, the two swapping layers are 1 and 11. This should lead to a symmetric temperature profile since the two layers are separated by the same distance in both directions in a periodic sense. This is why <I>Nbin</I> is restricted to being an even number. </P> <P>As described below, the total kinetic energy transferred by these <P>As described below, the total kinetic energy transferred by these swaps is computed by the fix and can be output. Dividing this swaps is computed by the fix and can be output. Dividing this quantity by time and the cross-sectional area of the simulation box quantity by time and the cross-sectional area of the simulation box Loading
doc/fix_thermal_conductivity.txt +19 −11 Original line number Original line Diff line number Diff line Loading @@ -16,7 +16,7 @@ ID, group-ID are documented in "fix"_fix.html command :ulb,l thermal/conductivity = style name of this fix command :l thermal/conductivity = style name of this fix command :l N = perform kinetic energy exchange every N steps :l N = perform kinetic energy exchange every N steps :l edim = {x} or {y} or {z} = direction of kinetic energy transfer :l edim = {x} or {y} or {z} = direction of kinetic energy transfer :l Nbin = # of layers in edim direction :l Nbin = # of layers in edim direction (must be even number) :l zero or more keyword/value pairs may be appended :l zero or more keyword/value pairs may be appended :l keyword = {swap} :l keyword = {swap} :l Loading @@ -43,16 +43,17 @@ Muller-Plathe method, the heat flux is imposed, and the temperature gradient is the system's response. gradient is the system's response. The simulation box is divided into {Nbin} layers in the {edim} The simulation box is divided into {Nbin} layers in the {edim} direction. Every N steps, Nswap pairs of atoms are chosen in the direction, where the layer 1 is at the low end of that dimension and following manner. Only atoms in the fix group are considered. The the layer {Nbin} is at the high end. Every N steps, Nswap pairs of hottest Nswap atoms in the bottom layer are selected. Similarly, the atoms are chosen in the following manner. Only atoms in the fix group coldest Nswap atoms in the middle later are selected. The two sets of are considered. The hottest Nswap atoms in layer 1 are selected. Nswap atoms are paired up and their velocities are exchanged. This Similarly, the coldest Nswap atoms in the "middle" layer (see below) effectively swaps their kinetic energies, assuming their masses are are selected. The two sets of Nswap atoms are paired up and their the same. Over time, this induces a temperature gradient in the velocities are exchanged. This effectively swaps their kinetic system which can be measured using commands such as the following, energies, assuming their masses are the same. Over time, this induces which writes the temperature profile (assuming z = edim) to the file a temperature gradient in the system which can be measured using tmp.profile: commands such as the following, which writes the temperature profile (assuming z = edim) to the file tmp.profile: compute ke all ke/atom compute ke all ke/atom variable temp atom c_ke[]/1.5 variable temp atom c_ke[]/1.5 Loading @@ -65,6 +66,13 @@ conjunction with the swap rate N, allows the heat flux to be adjusted across a wide range of values, and the kinetic energy to be exchanged across a wide range of values, and the kinetic energy to be exchanged in large chunks or more smoothly. in large chunks or more smoothly. The "middle" layer for velocity swapping is defined as the {Nbin}/2 + 1 layer. Thus if {Nbin} = 20, the two swapping layers are 1 and 11. This should lead to a symmetric temperature profile since the two layers are separated by the same distance in both directions in a periodic sense. This is why {Nbin} is restricted to being an even number. As described below, the total kinetic energy transferred by these As described below, the total kinetic energy transferred by these swaps is computed by the fix and can be output. Dividing this swaps is computed by the fix and can be output. Dividing this quantity by time and the cross-sectional area of the simulation box quantity by time and the cross-sectional area of the simulation box Loading
doc/fix_viscosity.html +20 −13 Original line number Original line Diff line number Diff line Loading @@ -25,7 +25,7 @@ <LI>pdim = <I>x</I> or <I>y</I> or <I>z</I> = direction of momentum transfer <LI>pdim = <I>x</I> or <I>y</I> or <I>z</I> = direction of momentum transfer <LI>Nbin = # of layers in pdim direction <LI>Nbin = # of layers in pdim direction (must be even number) <LI>zero or more keyword/value pairs may be appended <LI>zero or more keyword/value pairs may be appended Loading Loading @@ -57,18 +57,19 @@ momentum flux is imposed, and the shear velocity profile is the system's response. system's response. </P> </P> <P>The simulation box is divided into <I>Nbin</I> layers in the <I>pdim</I> <P>The simulation box is divided into <I>Nbin</I> layers in the <I>pdim</I> direction. Every N steps, Nswap pairs of atoms are chosen in the direction, where the layer 1 is at the low end of that dimension and following manner. Only atoms in the fix group are considered. Nswap the layer <I>Nbin</I> is at the high end. Every N steps, Nswap pairs of atoms in the bottom layer with positive velocity components in the atoms are chosen in the following manner. Only atoms in the fix group <I>vdim</I> direction closest to the target value <I>V</I> are selected. are considered. Nswap atoms in layer 1 with positive velocity Similarly, Nswap atoms in the middle later with negative velocity components in the <I>vdim</I> direction closest to the target value <I>V</I> are components in the <I>vdim</I> direction closest to the negative of the selected. Similarly, Nswap atoms in the "middle" layer (see below) with target value <I>V</I> are selected. The two sets of Nswap atoms are paired negative velocity components in the <I>vdim</I> direction closest to the up and their <I>vdim</I> momenta components are swapped within each pair. negative of the target value <I>V</I> are selected. The two sets of Nswap This resets their velocities, typically in opposite directions. Over atoms are paired up and their <I>vdim</I> momenta components are swapped time, this induces a shear velocity profile in the system which can be within each pair. This resets their velocities, typically in opposite measured using commands such as the following, which writes the directions. Over time, this induces a shear velocity profile in the profile to the file tmp.profile: system which can be measured using commands such as the following, which writes the profile to the file tmp.profile: </P> </P> <PRE>fix f1 all ave/spatial 100 10 1000 z lower 0.05 vx & <PRE>fix f1 all ave/spatial 100 10 1000 z lower 0.05 vx & file tmp.profile units reduced file tmp.profile units reduced Loading @@ -81,6 +82,12 @@ conjunction with the swap rate N, allows the momentum flux rate to be adjusted across a wide range of values, and the momenta to be adjusted across a wide range of values, and the momenta to be exchanged in large chunks or more smoothly. exchanged in large chunks or more smoothly. </P> </P> <P>The "middle" layer for momenta swapping is defined as the <I>Nbin</I>/2 + 1 layer. Thus if <I>Nbin</I> = 20, the two swapping layers are 1 and 11. This should lead to a symmetric velocity profile since the two layers are separated by the same distance in both directions in a periodic sense. This is why <I>Nbin</I> is restricted to being an even number. </P> <P>As described below, the total momentum transferred by these velocity <P>As described below, the total momentum transferred by these velocity swaps is computed by the fix and can be output. Dividing this swaps is computed by the fix and can be output. Dividing this quantity by time and the cross-sectional area of the simulation box quantity by time and the cross-sectional area of the simulation box Loading
doc/fix_viscosity.txt +20 −13 Original line number Original line Diff line number Diff line Loading @@ -17,7 +17,7 @@ viscosity = style name of this fix command :l N = perform momentum exchange every N steps :l N = perform momentum exchange every N steps :l vdim = {x} or {y} or {z} = which momentum component to exchange :l vdim = {x} or {y} or {z} = which momentum component to exchange :l pdim = {x} or {y} or {z} = direction of momentum transfer :l pdim = {x} or {y} or {z} = direction of momentum transfer :l Nbin = # of layers in pdim direction :l Nbin = # of layers in pdim direction (must be even number) :l zero or more keyword/value pairs may be appended :l zero or more keyword/value pairs may be appended :l keyword = {swap} or {target} :l keyword = {swap} or {target} :l Loading Loading @@ -46,18 +46,19 @@ momentum flux is imposed, and the shear velocity profile is the system's response. system's response. The simulation box is divided into {Nbin} layers in the {pdim} The simulation box is divided into {Nbin} layers in the {pdim} direction. Every N steps, Nswap pairs of atoms are chosen in the direction, where the layer 1 is at the low end of that dimension and following manner. Only atoms in the fix group are considered. Nswap the layer {Nbin} is at the high end. Every N steps, Nswap pairs of atoms in the bottom layer with positive velocity components in the atoms are chosen in the following manner. Only atoms in the fix group {vdim} direction closest to the target value {V} are selected. are considered. Nswap atoms in layer 1 with positive velocity Similarly, Nswap atoms in the middle later with negative velocity components in the {vdim} direction closest to the target value {V} are components in the {vdim} direction closest to the negative of the selected. Similarly, Nswap atoms in the "middle" layer (see below) with target value {V} are selected. The two sets of Nswap atoms are paired negative velocity components in the {vdim} direction closest to the up and their {vdim} momenta components are swapped within each pair. negative of the target value {V} are selected. The two sets of Nswap This resets their velocities, typically in opposite directions. Over atoms are paired up and their {vdim} momenta components are swapped time, this induces a shear velocity profile in the system which can be within each pair. This resets their velocities, typically in opposite measured using commands such as the following, which writes the directions. Over time, this induces a shear velocity profile in the profile to the file tmp.profile: system which can be measured using commands such as the following, which writes the profile to the file tmp.profile: fix f1 all ave/spatial 100 10 1000 z lower 0.05 vx & fix f1 all ave/spatial 100 10 1000 z lower 0.05 vx & file tmp.profile units reduced :pre file tmp.profile units reduced :pre Loading @@ -70,6 +71,12 @@ conjunction with the swap rate N, allows the momentum flux rate to be adjusted across a wide range of values, and the momenta to be adjusted across a wide range of values, and the momenta to be exchanged in large chunks or more smoothly. exchanged in large chunks or more smoothly. The "middle" layer for momenta swapping is defined as the {Nbin}/2 + 1 layer. Thus if {Nbin} = 20, the two swapping layers are 1 and 11. This should lead to a symmetric velocity profile since the two layers are separated by the same distance in both directions in a periodic sense. This is why {Nbin} is restricted to being an even number. As described below, the total momentum transferred by these velocity As described below, the total momentum transferred by these velocity swaps is computed by the fix and can be output. Dividing this swaps is computed by the fix and can be output. Dividing this quantity by time and the cross-sectional area of the simulation box quantity by time and the cross-sectional area of the simulation box Loading
