diff --git a/doc/src/fix_deform_pressure.rst b/doc/src/fix_deform_pressure.rst index f2881c5e28..b01e898c65 100644 --- a/doc/src/fix_deform_pressure.rst +++ b/doc/src/fix_deform_pressure.rst @@ -172,10 +172,10 @@ specific details of a simulation. Testing different values is recommended. By default, there is no limit on the resulting strain rate in any dimension. A maximum limit can be applied using the :ref:`max/rate ` -option. Akin to :doc:`fix nh `, pressures in different dimensions -can be coupled using the :ref:`couple ` option. This means -the instantaneous pressure along coupled dimensions are averaged and the box -strains identically along the coupled dimensions. +option. Akin to :doc:`fix npt and nph `, pressures in different +dimensions can be coupled using the :ref:`couple ` option. +This means the instantaneous pressure along coupled dimensions are averaged +and the box strains identically along the coupled dimensions. The *pressure/mean* style changes a dimension's box length to maintain a constant mean pressure defined as the trace of the pressure tensor. @@ -204,7 +204,7 @@ off-diagonal component of the pressure tensor. This option attempts to maintain a specified target value using a linear controller where the tilt factor T evolves according to the equation -.. parsed-literal:: +.. math:: \frac{d T(t)}{dt} = L(t) k (P - P_t) @@ -225,17 +225,17 @@ the applied strain using the :ref:`max/rate ` option. The *erate/rescale* style operates similarly to the *erate* style with a specified strain rate in units of 1/time. The difference is that the change in the tilt factor will depend on the current length of -the box perpendicular to the shear direction, L, instead of the -original length, L0. The tilt factor T as a function of time will +the box perpendicular to the shear direction, *L*, instead of the +original length, *L0*. The tilt factor T as a function of time will change as -.. parsed-literal:: +.. math:: - T(t) = T(t-1) + L\*erate\* \Delta t + T(t) = T(t-1) + L \cdot \mathrm{erate} \cdot \Delta t -where T(t-1) is the tilt factor on the previous timestep and :math:`\Delta t` -is the timestep size. This option may be useful in scenarios where -L changes in time. +where T(t-1) is the tilt factor on the previous timestep and +:math:`\Delta t` is the timestep size. This option may be useful +in scenarios where *L* changes in time. ----------