Commit 53365acc authored by Ann Almgren's avatar Ann Almgren
Browse files

adjust particle time step text

parent 39dc6c6e

docs/source/InputsTimeStepping.rst

+2 −2
Original line number Diff line number Diff line
@@ -54,7 +54,7 @@ There are several ways that the inputs are used to determine what time step 
is used in the evolution of the fluid-particle system in MFiX-Exa.   



1) In a pure particle case, the :cpp:`mfix.fixed_dt`, if specified, is only used to determine the frequency

of outputs, it has no effect on the "subdt" used in the particle evaluation. If you do not specify a positive

of outputs, it has no effect on the "dtsolid" used in the particle evaluation. If you do not specify a positive

value of :cpp:`mfix.fixed_dt` then the code will abort.



.. highlight:: c++
@@ -63,7 +63,7 @@ value of :cpp:`mfix.fixed_dt` then the code will abort. 


    amrex::Abort::0::If running particle-only must specify fixed_dt in the inputs file !!!



The particle time step "subdt" is determined by computing the collision time "tcoll" from particle properties,

The particle time step "dtsolid" is determined by computing the collision time "tcoll" from particle properties,

then setting "dtsolid" to be "tcoll / 50".



2) In a pure fluid case, there are two options: