[gewuzhizhi]

hello everyone, i'm now wrting a udf to access some flow parameters on an interior face,such as pressure and velocity,etc. during each iteration. However, the document provided by fluent says that the face macro (F_P,F_U,etc) can not be used on interior face, so do you have any ideas to visit the parameters? or can i read the adjacent cell's value?

the solver is density based ns equation solver

[`e`]

Fluent is a finite volume method solver and therefore the velocity and pressures are calculated for each cell (at their centres). Nodal values are interpolated. Why not use the cell centroid values (C_U etc) instead, what do you want your UDF to achieve?

[gewuzhizhi]

Originally Posted by `e`

Fluent is a finite volume method solver and therefore the velocity and pressures are calculated for each cell (at their centres). Nodal values are interpolated. Why not use the cell centroid values (C_U etc) instead, what do you want your UDF to achieve?

thanks for your reply. actually I am try to access the interior face values to revise the coresponding parameter on the inlet. Now, I have a new idea that is to read the adjacent cell of the interior face. there are some macros to achieve this goal.

[Prabhumsrit]

Can u please send any UDF code to measure the Velocity and pressure interior face.

[Prabhumsrit]

Originally Posted by gewuzhizhi

thanks for your reply. actually I am try to access the interior face values to revise the coresponding parameter on the inlet. Now, I have a new idea that is to read the adjacent cell of the interior face. there are some macros to achieve this goal.

I want to measure the velocity and pressure on interior face in Nozzle design and also required further thrust calculation. Please share any details with u and it is useful for my project and