Issue link: https://resources.randsim.com/i/1508712
E L I T E C H A N N E L PA R T N E R simulation@rand.com | RandSIM.com | 888.483.0674 Does Ansys Fluent with a Native GPU Solver Live Up to the Hype? About the Tests We compared the new Ansys Fluent native GPU solver and the CPU solver in four different scenarios. We ran our CPU simulations on the Rand Simulation CFD cluster: • CPU: Xeon® Gold 6242 • MSRP $3,000 + RAM + Motherboard • CPU Drivers: N/A We ran our GPU simulations on prep/post machines: • GPU: Quadro RTX8000 and RTX4000 • MSRP $5,000 • GPU Drivers Release 5/11/23, Version 30-0-14-7444 We recorded all times after convergence was achieved. Scenarios We tested four scenarios with 2 to 33 million cells. These scenarios encompass a variety of cell types, solver settings, and physics. Scenario: TEST 1 External Flow Over Passenger Vehicle TEST 2 Internal Flow in Mixing Tank TEST 3 Compressible Flow in Generic Combustor TEST 4 Vehicle Exhaust Model Cell Type: Projected Octree Polyhedral Poly-hex Mixed Solver: Pressure-based segregated solver, Least Square cell- based, steady Pressure-based segregated solver, Least Square cell- based, steady Pressure-based segregated solver, Least Square cell- based, steady Pressure-based coupled solver, Least Squares cell based, steady Models: GEKO k-omega Turbulence GEKO k-omega Turbulence, MRF GEKO k-omega Turbulence, Ideal gas compressible SST k-omega Turbulence Results Summary Highlight After running all the tests and analyzing the data, we found that with an investment in a $1,800 GPU and an upgrade from Premium to Enterprise, which costs $7,000, companies that currently run simulations on four cores can expect a 7x speed increase when moving to the GPU solver. Details All results presented in the graphs below were run on an RTX 8000 (the $5,000 graphics card). It is important to note that at the time this test was performed, only a segregated solver was available (for the GPU solver). We expect that a coupled solver will be available in 2024.