mathias
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Please chech that line in the code:
Vector
You can adjust that with setting the https://en.wikipedia.org/wiki/Buoyancy -Force. That can be positive or negative.. see our particle code examples..
Both approaches are very simular and both has been validated. I would rather propose that you find out why your results fluctuate? If Re_p is high, it might be natural..
Raeli, Alice, Borello, Eloisa Salina, Serazio, Cristina, Czelusniak, Luiz Eduardo, Bingert, Tim Niklas, Krause, Mathias J., and Dario Viberti. “Analysis of Lattice Boltzmann Method Potentials for Understanding Underground Fluid Storage Microscale Phenomena.” Paper presented at the OMC Med Energy Conference and Exhibition, Ravenna, Italy, ISDN 978-88-946678-2-0, April 2025.
We have a couple of working stl at our many example.. have a look there.. we also use very complex stls with GB sizes and they work. You need to avoid double layers and holes..
Did you check that your stl-surface is watertight and enirely closing the fluid domain?
Did you check that the scaling is right? Does the dx lenth (given in meter) fits to the by 0.001 scaled values of the stlReader?
Option 2 is what is usually been doen and what OpenLB uses as well!
We can not give such details support here. But you may consider https://www.openlb.net/consortium/ .
It seems like you are using the wrong formal parameter in the calling method. Please have a look at the interface discription or at another OpenLB example using the same interface.
Can you provide the output for CPU and GPU using double in both cases?
Can you check on the results for GPUs unsing double insteat of float?
Have a look at the porous media examples.
Please, have a look at the other thermal examples..
The simulatio is unstable. There can be many reasons for it. Have you tried a finer resolution? You can stop the simulation shortly before it gets to infinity and output the results and check for the results in oder to find a possible source by looking at the location of high values.