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how to set the timevarying uniform value of internalField?

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Old   April 3, 2011, 07:59
Default how to set the timevarying uniform value of internalField?
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Jianxi Yao
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does someone knows how to set the internalField value which vary with time in an unsteady simulation? i know that there is a timeVaryingUniformFixedValue for BC,but which one for internalField?
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Old   April 4, 2011, 04:06
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Samuel ARNAUD
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Hi Jianxi,

you don't have to put a time varying value for the internalField as it already behaves like this.
Put an "uniform value" in /0 folders and it will vary by itself during the calculation.
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Old   April 4, 2011, 05:23
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thank you Sam! my computational model is that a body move in a field with a constant velocity in the x direction but in the y direction with a time-varying velocity. So i just have to set a time-varying boundary conditions but not the internalfield values?
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Old   April 4, 2011, 17:58
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InternalField is not a boundary condition, it's an INITIAL condition. Which means that it's set only at the begining and re-calculated during the simulation.

If you have constant speed in the x direction, set a constant speed BC on your x-normal inlet wall.

To set the time varying BC in the Y direction, set the Y speed vasying BC on one of your Y-normal walls, and set the pressure on the opposite Y-normal wall.

This may not converge, y recommend that you have some fixed walls in your model, separating the different inlet and outlet patches. I'll upload a drawing to explain myself
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Old   April 5, 2011, 04:33
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Quote:
Originally Posted by lfbarcelo View Post
InternalField is not a boundary condition, it's an INITIAL condition. Which means that it's set only at the begining and re-calculated during the simulation.

If you have constant speed in the x direction, set a constant speed BC on your x-normal inlet wall.

To set the time varying BC in the Y direction, set the Y speed vasying BC on one of your Y-normal walls, and set the pressure on the opposite Y-normal wall.

This may not converge, y recommend that you have some fixed walls in your model, separating the different inlet and outlet patches. I'll upload a drawing to explain myself
Hi Lfbarcelo
i will try it. i hope that can work. thanks!
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