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August 4, 2025 at 9:10 pm
abtharpe42
SubscriberI'm trying to figure out how to use the native gpu solver in Fluent 2024 R1 on my desktop to simulate a combustor with intricate nozzle geometry. My mesh has almost 4.8 million poly-hexcore cells to get good resolution in the small nozzle passageways. I can probably get the cell count decently lower than this. The chemkin mechanism I'm using is the Stagni 2023 mechanism with roughly 30 species and 200 reactions. I know Fluent 2025 R2 just released with the Chemistry Agglomeration feature for the native GPU solver, but I probably won't have access to that for a while. I'm stuck using 2024 R1, which has no chemistry acceleration and is strictly allows Direct Integration only. I also set my simulations to double percision. My workstation desktop has an Intel i9-14900 CPU with 8 p-cores and 16 e-cores (hyperthreading disabled) and 64 GB of RAM. The GPU is an NVIDIA RTX Ada 2000 with 16 GB of VRAM. My attempts to run a simulation up to this point has yielded slow intialization phases, especially with hybrid-initialization, and seemingly freezing or stalling at the start of the calculation phase with no progress for minutes on end. I need to know if my combustion scenario that I've described above is overkill for this computer, as I have not found a straight answer to this online. I suspect that it is in fact too heavy for my hardware, considering the long wait times. When using 2 cores, my CPU utilization stays at 100% and my GPU oscillates anywhere between 30% to 100%. What recommendations, advice, or rules of thumb do you guys have that could help me make sure that I am utilizing my GPU as optimally as possible?
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