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Convergence problem on multicyclone gas-liquid separator |
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#1 |
New Member
Simon Rodriguez
Join Date: Nov 2014
Posts: 13
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Hi,
I've been working on the simulation of a simple vessel with an inlet and two outlets (one on top and the other on bottom). The gas-liquid mixture gets into this vessel and it is split in two streams by a tee. Every stream enters a pipe that acts as a cyclonic separator. I ran tests in the laboratory and I found that the systems reaches a quasi-steady state when the liquid gets a determined level, and I have no liquid int top outlet nor gas in bottom outlet. I need to get a cfd model that describes this behavior. I generated a coarse mesh and started to run simulations with the mixture model and the k-omega SST model, steady state solver, the gas being the primary phase. But the model was highly divergent. I healed the geometry in some areas where was not good and the system did not diverge anymore, however the solution I am getting has a lot of gas in the bottom outlet. This is my first complete multiphase simulation and I've tried a lot of things, for example, i refined the mesh, I changed to K-epsilon, I ran the problem with no liquid at all in the inlet and then tried to incrementally add the liquid in the inlet stream, but I always find that the solution has a lot of gas in the bottom outlet or the system diverges. My questions for you are: 1. Is there any tips and tricks manual o best practices text in multiphase situations that can help me? 2. What turbulence model should I be using? Do you agree with me on K-omega SST. 3. Most important: Do you know any tricks I can use to improve the solutions I am obtaining? I append a raw image of the process (please don't be rude on my bad-drawing skills XD) I really appreciate your help and thank you in advance, PD: I also tried changing relaxation factors, and eulerian model. Nothing worked. |
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#2 |
New Member
Join Date: Nov 2017
Posts: 2
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Turbulence: RSM
multiphase model: VOF |
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cyclone separator |
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