Hello,

I would to get flow variables in UDF at specific coordinates. However I only see functions like C_V(c,t) or C_P(c,t) which required the cell and thread pointers.

So it is possible to know the cell and thread pointers with physical coordinates?

The only one solution I see for instance is to do a loop over all cells on the domain and to test their coordinates... I am not sure of efficiency

So, any ideas are welcome.

Thanks

Mickaël PERRIN

There might be an efficient way if we knew exactly what you are attempting. However, the only way I can think of is to loop to match the x, y, z location with the variable. If you can create a surface in your original mesh, i.e. so a thread ID exists for it, you could minimize the search time by focussing the search on that surface ID.

Thanks for your answer !

In fact, my main goal is to export data at specific location in all data files. I want to draw the pressure, speed,etc.. at specific locations in function of time.

I know how to do the loop over all data files. However, i have no idea of an efficient way to write into a file the pressure, speed at specific locations!

I hope this help you to find an efficient way !

Thanks again.

Best regards.

Mickaël PERRIN