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increasing Courant number

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Old   April 4, 2016, 06:48
Default increasing Courant number
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Hi friends!
I'm modeling a submerged buoyant turbulent jet of brine in ambient water tank. it is obvious to use a multiphase solver for this modeling. I'm dealing with twoPhaseEulerFoam solver of OoenFOAM. i prepared the model for run. but with setting the time step about 0.005 i faced the increasing of Courant number in each time step. for example after three time steps it reaches to 9 and then to 600 for time 4*0.005!!!
i know it could be emanated from many aspect of setting of model. but is there any body to help me with this ?
all the bests
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