TAGGED: bioreactor, floating-point-exception, gas-mixing, transient
April 3, 2023 at 7:40 pmPatrick KirbySubscriber
My question involves a mixing tank once again. In this case I recieve an error message indicating a floating point error after increasing the inflow through a sparger located near the bottom of the tank. All other settings similar, when the sparging rate is increased a floating point error occurs. I attempted to initialize the flowfield with the solution at the lesser sparging rate and also decreased the time step for the transient solver, but niether of these ideas worked. I am thinking that the mesh could be an issue, but the parameters describing the mesh seem acceptable.
Thanks for reading my post
April 4, 2023 at 3:44 pmSRPSubscriber
Can you please share statistics of your mesh?
Since floating point error occurs mainly due to the mesh.
April 4, 2023 at 3:54 pmPatrick KirbySubscriber
Hi SRP, I have two regions, one stationary and one moving making use of a sliding mesh. The associated mesh statistics are as follows:
Min Ortho quality: 0.11
Max Aspect Ratio: 21.0, a bit large and likely due to small sparging elements at the base of the geometry.
April 4, 2023 at 4:00 pmPatrick KirbySubscriber
I reworked my mesh a bit and I got things to run a bit longer, but still experienced a bit of a blow up. I'm using RSM (w/ scalable wall functions and a moving mesh) to model turbululence and the Eulerian-Eulerian mutliphase model. I actually had a bit of luck running the simulation as a mixture for mutliphase, but the outlet pressure boundary condition led to a build-up of gas.
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