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STR transient simulation using MRF

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Old   December 3, 2017, 13:41
Default STR transient simulation using MRF
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In the simulating of stirred tanks, one can use the steady state MRF (multiple reference frame) technique or a transient SM(sliding mesh) technique. Simulations in literature for single phase adopt either. However, two phase (Gas-liquid) simulations solve the transient NS (Navier Stokes) using MRF. Is this conceptually correct, ie what is the source of transients? In addition, what is the criteria for selecting timestep size?
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