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Old   August 29, 2014, 23:58
Default floefd boundary
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qinxiao
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When i select four surface loading 3m/s at the same time,and i select the surface respectlly four times loading 3m/s ,what's the difference?
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Old   September 21, 2014, 17:41
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Hi Henduocha,

I assume you mean that you apply a single inlet velocity boundary condition or you apply four seperate inlet velocity boundary conditions on these four surfaces.

If you look at the boundary condition reference coordinate system you will see that for one surface the reference system is the one of the surface you selected if it is a planar surface and the global coordinate system if it is a non-planar surface. In case you select a planar surface, the reference system changes to the global coordinate system as soon as you select the next surface. So in case you want to define a specific direction it becomes important to define the coordinate system for the correct definition of the direction.

I hope this helps,
Boris
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