[manish812]

Hey all!
So I'm trying to set up periodic boundary conditions for a special case, which has a spiral geometry, the problem is that there is not a proper symmetry between the two faces.

I know that you can set up (rotational) periodic boundary conditions only if you both the faces on either side overlap together, but this geometry is a spiral and there is an offset between the two faces, which don't exactly overlap.

The geometry that we're trying to analyze is of a precooler (a type of compact heat exchanger) whose coolant flows in a spiral as shown in green in the image, this can be simplified into a section (shown in the second image) which repeats periodically.

I have tried looking at the User Guide for the solution, but I couldn't find it :/

I want to know how to go about actually implementing this, so if anyone can point me in the right direction, it'll be very helpful!

Link to the image showing the boundary condition: https://imgur.com/a/T0mFKuD

TIA!

[manupanand]

Originally Posted by manish812

Hey all!
So I'm trying to set up periodic boundary conditions for a special case, which has a spiral geometry, the problem is that there is not a proper symmetry between the two faces.

I know that you can set up (rotational) periodic boundary conditions only if you both the faces on either side overlap together, but this geometry is a spiral and there is an offset between the two faces, which don't exactly overlap.

The geometry that we're trying to analyze is of a precooler (a type of compact heat exchanger) whose coolant flows in a spiral as shown in green in the image, this can be simplified into a section (shown in the second image) which repeats periodically.

I have tried looking at the User Guide for the solution, but I couldn't find it :/

I want to know how to go about actually implementing this, so if anyone can point me in the right direction, it'll be very helpful!

Link to the image showing the boundary condition: https://imgur.com/a/T0mFKuD

TIA!

You have to create geometry first in periodic. I think you can create spiral curve and revolve curve with respect to the spiral curve you created instead of axis. Periodic boundary can be given to the plane or surface you created.in fluent select the boundary and change the boundary type.

[manish]

I'm actually trying to map the outlet at the end of one pipe to the inlet of the other, I was initially thinking this has to be done with periodic boundary condition, but I feel like that's not possible now. I didn't quite understand what you meant by making the geometry in Periodic, could you please elaborate.

Is there a way to map the outlet at one end to the inlet at the other at all? I'm not able to understand how exactly one would solve this case with ANSYS Fluent. Please provide suggestions if any. TIA!

[manish]

I'm actually trying to map the outlet at the end of one pipe to the inlet of the other, I was initially thinking this has to be done with periodic boundary condition, but I feel like that's not possible now. I didn't quite understand what you meant by making the geometry in Periodic, could you please elaborate.

Is there a way to map the outlet at one end to the inlet at the other at all? I'm not able to understand how exactly one would solve this case with ANSYS Fluent. Please provide suggestions if any. TIA!