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Controlling variable step size with a parameter other than Courant Number

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Old   August 5, 2019, 07:00
Default Controlling variable step size with a parameter other than Courant Number
Mike Worth
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I'm using twoLiquidMixingFoam to model the washout of one fluid with another from a pipe. I can use the settings adjustTimeStep & maxCo to control the timesteps such that the flow is properly resolved, but this tends to result in output that doesn't show the washout in any detail.

Is it possible to add a condition of maximum change in overall system alpha (concentration)? That would allow me to clearly resolve the initial plug-flow washout, but then not waste loads of computation with a short timestep elsewhere in the simulation.

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adjusttimestep, maxco, twoliquidmixingfoam

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