AMReX Support Functions for 3D Surface Data output?

[mafiami]

Hello. I'm trying to get the 3D flow field data on the surface of a cylinder(or a truncated cone) every n time steps for post-process as the whole field data takes too much storage space. The data is on multiple level, and the finest level data is needed. Is there any functions in AMReX can be of help?

[WeiqunZhang]

I think you can use the EB capability to create the desired geometry for data output. When you need to output the field data on the surface, the EB information can tell you whether a cell is cut by the surface and where the boundary centroid is. You can create a particle container and add a particle to every cut cells not covered by fine levels. Then you can output the particle container.

If you need more help on any of the steps above, let us know.

[WeiqunZhang]

You could also do this without using EB. You create a particle container with a certain number of particles as sampling points.

The EB approach will have one particle per cut cell (that is not covered by fine level) and the number of particles may change during the run, whereas the second approach will have a fixed number of particles.

Depending on what you need, one might work better for you than the other.