First of all, I would like to thank the team around the OpenLB-Projekt for their interesting work.
Here is my Problem:
I would like to simulate flows in microfluidic channels. The idea is to investigate the quality of mixing elements in laminar flow. I set up a 3D-Tmixer with the two inlets having the same velocity.
.-> l…I<- velocity inlet (uniform)
… I .I .I.I
pressure or velocity outlet
The setup is supposed to be symmetrical.
I used ConstRhoBGK and BGK-Algorithm for a single Component with bounce-back boundaries.
At low Reynoldsnumbers the incompressible flow is symmetric. At a certain point the fluid swaps to the other side und engulfment flow is prevailing (N. Kockmann, Transport Phenomena in Micro Process Engineering).
I am just getting no engulfment flow! Is it maybe in the nature of the method!
I tried the very everything thing. Changing Re, inlet flow ratio, geometry itself. And I am fairly sure about the units und boundary parameters.
Second question: How reliable is OpenLB on predicting pressure loss (BGK)?
Can anybody help me with this?