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#1 |
New Member
Join Date: Aug 2010
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As we know, the advantage of VOF method is to conserve mass well.
But there will be some round off error after the advection calculation. For example, F could be less than zero or greater than one. We should reset these values back to the 0-1 range. However, after the adjustment, the total mass could be not equal to the initial value. How to make sure the mass exactly equal to the initial one? |
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#2 | |
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zhouquan
Join Date: Dec 2009
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Quote:
Maybe you need not set F equal zero or one, instead, a cell is defined to be empty when F is less than eps(=10e-6) and full when F is grater than 1-eps. PS: DO you model multiphase flow used VOF method with software(Fluent) or programming codes by yourself? |
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#3 | |
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Quote:
If I don't adjust F in those situations, F may lose its point in some cases. For a case in which F=1.02, however, the defination of F is the ratio of fluid and cell volume. It cannot be greater than one. Thus, if I do the dambreaking case. At the first glance, the total F is conserved. The actual fluid volume is also decreasing in fact. |
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