Hi, I am conducting a numerical simulation of a low speed axial compressor, where I am placing injection holes in the casing of the stator row. I would like to have a high-fidelity simulation, and a smooth interface casing-hole, so my questions is: is it possible to use some Autogrid feature to build the hole on top of the end wall so that I can have perfectly matched interfaces? is the feature Cooling-End wall holes described in the manual a possible solution approach?
It's something that could be used as a starting point, but it depends on the the position of the hole and the domain configuration. I guess you want to also add the domains above the stator, how do you plan to mesh everything?
Hi, I have the whole configuration (IGV + Rotor + Tandem Stator) meshed in Autogrid already. The positions would be the end walls, wheter is the hub or casing of the stator/rotor. And yes, I want to add these domains on top of the existing compressor domain, in a way that the interfaces are full matching. From what i see in the images, the cooling holes remove hole-shaped portions of the domain, so how can we add hole geometries on the compressor mesh?
You can add the holes using the features "Cooling holes" indeed, you are going to get the domain and surfaces created directly by Autogrid, but the mesh nodes won't be matching, for example:
- a shroud wall is added on top of the shroud: this represents the "matrix" that Autogrid uses to generate the holes
- add cooling holes: Autogrid will punch a hole into the matrix and fill it with a special mesh configuration
- on top of the shroud wall you can add a zR (meridional) effect (not shown in the picture) that would be actually connected to the other row, since the shroud wall takes the whole shroud.
Or in alternative, create the mesh of the cavity by hand, by revolving a face.