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December 1, 2013, 10:31
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strange wiggle in drag coefficient
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#1 |
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Senior Member
Join Date: Jan 2013
Posts: 134
Rep Power: 13  |
hi, in my simulation, LES of flow around a bluff body(see the figure), the drag and lift coefficients look like this.
There are some big wiggles in the value sometimes, but on the whole it looks OK. Usually in my understanding, or the simulation runs smoothly without this kind of wiggle, or it breaks down very soon after the first appearance of the wiggle. I really can not understand this phenomenon. Can some one explain why this is happening?  My simulation is performed on a relatively coarse mesh, pimpleFoam is used, and MaxCo is set to 2. |
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