Generated from /asc/home/flashdocs/FLASH3_33/source/physics/Hydro/Hydro_computeDt.F90 with ROBODoc v4.99.8 on Wed Oct 20 17:16:48 2010

**NAME**

Hydro_computeDt

**SYNOPSIS**

Hydro_computeDt(integer(IN) :: blockID, integer(IN) :: myPE, real(IN) :: x(:), real(IN) :: dx(:), real(IN) :: uxgrid(:), real(IN) :: y(:), real(IN) :: dy(:), real(IN) :: uygrid(:), real(IN) :: z(:), real(IN) :: dz(:), real(IN) :: uzgrid(:), real,pointer :: solnData(:,:,:,:), real,(INOUT) :: dtCheck, integer(INOUT) :: dtMinLoc(:) )

**DESCRIPTION**

Computes the timestep limiter for the hydrodynamical solver. For pure hydrodynamics, the Courant-Fredrichs-Lewy criterion is used. The sound speed is computed and together with the velocities, is used to constrain the timestep such that no information can propagate more than one zone per timestep.

**ARGUMENTS**

blockID -- local block ID myPE -- local processor number x, y, z -- coordinates dx, dy, dz -- deltas in each {x, y z} directions uxgrid, uygrid, uzgrid-- velocity of grid expansion in {x, y z} directions solnData -- the physical, solution data from grid dtCheck -- variable to hold timestep constraint dtMinLoc(5) -- array to hold location of cell responsible for minimum dt: dtMinLoc(1) = i index dtMinLoc(2) = j index dtMinLoc(3) = k index dtMinLoc(4) = blockID dtMinLoc(5) = myPE

High-Energy Density Physics

Thermonuclear-Powered Supernovae

Fluid-Structure Interaction

Implicit Solvers

Code Requests

Download

Contributed code

Flash Test downloads

Visualization downloads

Documentation and User Support

Publications

FLASH internal

The Flash Center for Computational Science is based at the University of Chicago and is supported by U.S. DOE and NSF.