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Old   February 3, 2006, 12:42
Default Negative Volumes
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Essentially, when simulating a block falling under gravitational constraints, Fluent will not remesh to give a new mesh after each time step, but will step in time until there are negative volumes and subsequently fail. I wonder if it has to do with my UDF defining the properties of the block or the way I created my mesh in Gambit, because it seems as though every other detail is identical to the tutorial.

thanks, philip
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Old   February 4, 2006, 05:49
Default Re: Negative Volumes
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Check the volume in the Gambit. If it is showing negative volume Then mesh it by reducing the interval count.
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Old   February 4, 2006, 11:18
Default Re: Negative Volumes *NM*
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Old   February 6, 2006, 11:18
Default Re: Negative Volumes
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I'm fairly certain that that isn't the problem, if I make the time step small enoungh, such that a couple of time steps can occur before the block in question crosses any cell boundaries (i.e. it only deforms the initial mesh without creating negative volumes). I do have the remeshing setting on and set to an interval of 1, so it seems like it should be remeshing. Anyways, thank you very much for your input; most appreciated.

Best regards,

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