[wudong]

I am new to OpenFOAM, and I'm currently working on a simple closed loop flow field test using the pimpleFoam solver. My goal is to simulate the effect of a pump to maintain a constant flow rate within the model. This model has no inlets or outlets, only walls. I've set up a momentum source in a specific region of the model to represent the pump's effect on the flow rate.

I've tried using two different sources: SemiimplicitSource and massSource. However, after running the simulation for some time, I noticed that the flow field changes significantly, and the flow direction becomes very distorted. This is far from my expectation, as I aim to maintain a constant flow rate within the model.

I would like to seek advice from the community on the following:

I am looking for thoughts on whether there is a recommended way to set up sources to model constant flow in a closed loop flow field? Would it be more appropriate to model this type by setting up the source term or setting up new boundary conditions.

Thank you very much for your help!

I’ve attached my source settings and some screenshots of the simulation results for reference (if available).

Looking forward to your responses!

Thanks!

Here is my simulation picture.

https://ibb.co/tYN3pz2
https://ibb.co/ZBKschL
https://ibb.co/chBsRry
https://ibb.co/DfmQrV8