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September 10, 2004, 22:50 |
negative volume
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#1 |
Guest
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Hi..
Anyone ever facing this .. *** WARNING #090 *** VALUE ELOG*YPLUS OR LOG*EFFVIS/(CAPPA*VISCOS) IS LESS THAN 1.1 AT 149 CELLS.UPLUS=YPLUS LAW IS USED. IF THIS SITUATION PERSISTS, INCORRECT RESULTS MAY BE OBTAINED. After several iteration my calculation stopped, because star detect a negative volume. My case is transient sliding mesh. Thanks in advance.. ^ ^ | |
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September 12, 2004, 08:54 |
Re: negative volume
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#2 |
Guest
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The warning #090 is telling you that your mesh is too fine for the high Re turbulence model which you are using. This is just a question of modelling accuracy. You can choose whether to ignore it, change the mesh or change the turbulence model.
The negative volume is something else: this is telling you that your mesh motion is wrong and is corrupting the mesh. Check your mesh motion commands. You could do a mesh preview run: this will highlight the problem faster than you doing a full analysis. |
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