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Finer mesh gives the worse results

Question asked by Choon-Sik Jhun on Mar 26, 2013
Latest reply on Apr 5, 2013 by Jared Conway

Dear Group,

 

Does anyone have the problem like this, i.e., given the same model, a finer mesh gives the worse results.

We're simulating a pump and the rotor is imbedded in the rotating region. We have two inlets and outlets, and expect to see the balanced (i.e., equal) amount of flow from both outlets. Total volume flow coming in through the inlets is 4 LPM, and the outlet flows are expected to be 2 LPM from each outlet. With a 50,000 elelements we get a fairly even flow like ~2.2 LPM from each outlet, but with a 0.3 million elements, we get ~2.5 LPM (which is farther off from 2 LPM). Any advice will be greatly appreciated.

 

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