Learning Forum

[Ghislain Madiot]

Hi Rob,

Thanks for your response. If I have understood your response correctly, I have previously developed a similar model. I’ve created a “Q2D model” (as shown in the figure) in comparison to the traditional 3D approach.

This model contains a singular cell in the radial direction, with symmetry boundary conditions at the upper and lower faces, as well as a sliding mesh at the rotor/stator interface. If this aligns with your scenario you advised, I might encounter similar computational time challenges, which is why I’m considering transitioning to a 2D approach.

I came up with two two potential ideas, though I’m uncertain about their feasibility.

Firstly, based on my research, prior studies have employed multiple replications of the stator ports, wherein the cycle occurs as the rotor domain moves upward. However, the drawback of this method is the necessity to replicate as many ports as cycles required to achieve a steady-state pattern in the rotor.

Could it be possible to establish a repeated symmetry for the stator domain in order to have a correct flow distribution when channels pass?

Another concept involves translating the mesh upon crossing the “periodic line.” If each channel possesses its own domain, could it be feasible to reposition each mesh block to its initial location when they surpass a specified value in the Y-axis? This approach would mimic the moving channel mechanism while preserving fluid characteristics.

Nevertheless, if CFX offers the potential for a significant breakthrough, I’m open to transitioning to it and mimic the process outlined in the paper referenced above.