I am using CFD to optimizing the geometry of a competitive swim cap (including surface textures and patterns). As a baseline for comparison, I first performed an incompressible water flow simulation around a perfect sphere.
However, I have encountered an issue with the results. The simulation reports a drag coefficient of only 0.05 for the sphere, which seems much lower than the values I would expect based on the literature. This makes me suspect that there may be an error in my simulation setup or post-processing.
I would greatly appreciate any technical support or suggestions on how to diagnose and resolve this issue. If there are any common setup mistakes or parameters that I should check, I would be very grateful for any guidance.
Here’s the link to my project: https://www.simscale.com/workbench/?pid=1725414737655982545&rru=a58de216-b061-42a4-ad83-12fe8cfd943d&ci=63db602a-437a-4dac-86b3-7be135be8085&ct=PLOT&mt=SIMULATION_RESULT