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January 24, 2020, 04:03 |
Multi-phase Transonic Flow
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#1 |
New Member
Piotr
Join Date: Oct 2019
Posts: 5
Rep Power: 7 |
Hello,
I have a problem with the multi-phase transonic simulation. It diverges. I try to make a simulation of DeLaval nozzle, where shock waves appear. Firstly I did a simulation of single-phase, it works perfectly fine, as you can see on the picture below. Settings: Inlet Total Pressure = 98880 Pa Total Temperature 297.15 K Outlet Static Pressure = 55000 Pa Operating pressure = 0Pa Ideal-gas k-w SST, y+ ~1, Then I tried to move it to Euler-Euler framework. The secondary phase is water droplets. The dispersed turbulence model is on. The volume fraction of water is 1e10-6 and the droplet diameter is 1e10-8. Although it start to compute easily, it diverges after some time. I have already tried transient and steady approach, all discretization schemes, Simple and Couple methods, Implicit and Explicit formulation for volume fraction. None of them work. What is happening: -The solution is getting shifted away from the nozzle center line -The pressure between shock wave and outlet starts to fluctuate -Mass imbalance starts to appear on the shock wave Either The Fluent is not capable of solving the interaction of droplets with shock waves or I am doing something wrong. I would be honestly grateful for any suggestions. |
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Tags |
fluent, multiphase, nozzle, shock wave, transonic |
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