boundary condition with user fortran

May 11, 2006, 12:19

Hello,

I try do set a time- and locationdependent boundary condition for a 3D-simulation using a user fortran routine. That routine interpolates the values I need out of a table I got from a 2D-simulation.

My problem is, that if I check the interpolated values which my routine gives back to the calculation in the beginnig of a timestep are correct. But if I write a backup-file at the end of the same timestep, the values I get are different to the values i've set in the beginning of that timestep.

Does anybody know that problem ?

May 11, 2006, 15:33

Hi Lena,

Make sure you are looking at the "Hybrid" values at the boundary. The conservative values represent the control volume next to the boundary and will differ from the boundary value.

Regards, Robin

May 12, 2006, 03:50

Hi Robin,

That was actually my mistake!

Thanks a lot for helping me

Regards, Lena

May 11, 2006, 12:19	boundary condition with user fortran	#1
Lena Guest Posts: n/a	Hello, I try do set a time- and locationdependent boundary condition for a 3D-simulation using a user fortran routine. That routine interpolates the values I need out of a table I got from a 2D-simulation. My problem is, that if I check the interpolated values which my routine gives back to the calculation in the beginnig of a timestep are correct. But if I write a backup-file at the end of the same timestep, the values I get are different to the values i've set in the beginning of that timestep. Does anybody know that problem ?

May 11, 2006, 15:33	Re: boundary condition with user fortran	#2
Robin Guest Posts: n/a	Hi Lena, Make sure you are looking at the "Hybrid" values at the boundary. The conservative values represent the control volume next to the boundary and will differ from the boundary value. Regards, Robin

May 12, 2006, 03:50	Re: boundary condition with user fortran	#3
Lena Guest Posts: n/a	Hi Robin, That was actually my mistake! Thanks a lot for helping me Regards, Lena

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