fan simulation advice
Hi,
I am simulating an axial fan that is forcing air through a radiator. Both are contained in a large duct. I cannot get CFX to converge steady state and have tried transient successfully but transient takes too long to solve. I have tried all the things recommended in the manual for steady state including all sorts of physical timescales. I've also tried LTS factor that improves things slightly but still doesn't get good residual values. I have tried refining my mesh but it doesn't help. Why is there this problem with CFX and would switching to another solver help (such as Fluent)? Plotting residuals shows problem areas where the cell size is large and the flow is slow. I have even tried another fan with the same setup and it gives the same problem. Please can someone help. Thanks, ijk |
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Good luck. |
Thank you both for your responses. My steady state residual levels are high but the quantities I am interested in are stable with steady state. Sliding mesh is much more accurate for what I am simulating anyway.
Should I expect Fluent and CFX to take the same time to solve the problem transient (for the same timestep)? |
CFX and Fluent are very different technology solvers and there is often a considerable speed difference between them. In some of my recent work the difference was a factor of 30.... but it depends on the simulation so you will have to benchmark it for yourself. There is no general rule.
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Glenn,
That is very interesting. I will try a few test cases. Does anyone know if Fluent or CFX would be faster for transient fan simulations? |
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