|July 5, 2013, 03:11||
Sub-iterations for transport equation in drift-flux
Join Date: Jul 2013
Posts: 3Rep Power: 5
I am currently working on a drift-flux (or algebraic-slip) model to simulate the sedimentation of sand in water.
After solving the transport equation for sand, I use the packingLimiter.H like in twoPhaseEulerFoam in order to maintain the maximum packing concentration of sand (say 0.6).
If I take the time-step dt too large, a certain computational cell can be filled with an amount of sand such that the packingLimiter cannot reduce the sand to the maximum packing concentration. If the packing concentration exceeds a value of 1.0, the solving process is aborted by the solver.
I am wondering if I could decrease the timestep dt only for solving the transport equation. Say, 10 sub-iterations on the transport equation are chosen with for each sub-iteration the timestep 0.1*dt. Each time the packingLimiter is applied after a sub-iteration.
Does anybody know how I can call the magnitude of the timestep in the source code, such that I can modify it?
Thanks in advance!
|July 5, 2013, 04:03||
Join Date: Oct 2011
Location: Göteborg, Sweden
Posts: 10Rep Power: 7
For the twoPhaseEulerFoam solver the time step is set from the include of:
For subiterations, perhaps you would find some interest in: http://www.cfd-online.com/Forums/ope...ime-loops.html.
I guess you would like to use subCycles to achieve subiterations for some part of the code. Have a look at e.g the alphaEqn.H in twoPhaseEulerFoam. There a subCycle is used to solve the dispersed phase continuity equation. Inside the loop the deltaT is split according to how many sub-iterations you have specified. The code, subCycle.H and subCycleTime.H, will help you with the time step splitting.
|drift-flux, sub-iterations, transport equation|
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