# how to set the timevarying uniform value of internalField?

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 April 3, 2011, 07:59 how to set the timevarying uniform value of internalField? #1 New Member   Jianxi Yao Join Date: Apr 2011 Posts: 15 Rep Power: 5 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?

 April 4, 2011, 04:06 #2 Member   Samuel ARNAUD Join Date: Feb 2011 Location: Grenoble, FRANCE Posts: 39 Rep Power: 5 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. __________________ Sam

 April 4, 2011, 05:23 #3 New Member   Jianxi Yao Join Date: Apr 2011 Posts: 15 Rep Power: 5 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？

April 4, 2011, 17:58
#4
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Fran
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Location: Buenos Aires
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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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April 5, 2011, 04:33
#5
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Jianxi Yao
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Quote:
 Originally Posted by lfbarcelo 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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