gas-liquid two-phase flow in microchannel
Hello everyone, I'm a newbie to the FLOW-3D, and trying to setup a simplified 2-D gas-liquid two-phase flow in microchannel to simulate the flow pattern. The channel is a T-shaped microchannel, its width is 0.5mm, the gas (air) and liquid (water) are introduced in the channel from the opposite inlets, the velocities of the gas and liquid are 0.7m/s and 0.5m/s, respectively. The channel for two-phase flow is 0.01m in the length. The outlet is open to atmospheric conditions. And the finish time is set to 10 sec. But the simulation always terminate unexpectedly.
Does anyone can tell me what goes wrong or share some similar examples with me. |
does it terminate with an error message? Does the solver run any distance or does it terminate right away?
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If the difference is relatively small, ~ 2-3, then you may be able to achieve convergence by introducing limited compressibility, or switching to a different pressure solver. Does it start failing right away? Have you talked to support? |
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No, it doesn't start failing right away, and I haven't talked to support. |
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I found this in the help contents, "Two-fluid problems may be composed of either two incompressible fluids or one incompressible and one compressible fluid". So I guess that's the problem I had. Thank you very much for your help. |
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Limitted compressibility does not add the full equation-of-state compressibility which the full gas model does (ICMPRS=1). Instead it adds, the acoustic compressibility, where the density changes are assumed small, and pressure changes is a linear function of density changes: dP/dt=c^2drho/dt, where c is the speed of sound. This is good for a) tracking acoustic waves, and b) softening stiff systems for better convergence. Looks like the latter worked out for you. |
Dear LyngHoo
Please send me you email, maybe I can cooperte with you, regards Dr. M. Haghshenas haghshenas@cc.iut.ac.ir |
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