I'll ask you questions about downforce and mesh.

dhk120712 — Wed, 08 Dec 2021 07:25:21 GMT

Hello, teachers. I'm sorry to ask you this question because I'm not good at English.

I am a student studying CFD.

I'm studying the downforce of the rear wing, and the first analysis result was 86N, so the mesh size was smaller, and the analysis result was 91N.

After that, the analysis was conducted with a smaller mesh size, and the result was 77N. And the number of repetitions decreased by about 100.
I thought the third would come out bigger or similar, but the price suddenly decreased so much that I'm a little embarrassed.
I wonder why these results came out by reducing the mesh size. And I wonder if the results of this few interpretations are the right answer.
(The wing model is just a model that I made on my own.)

Re: I'll ask you questions about downforce and mesh.

karol.suchon — Wed, 08 Dec 2021 14:38:59 GMT

Hello.

probably in the third analysis, the software achieves the accuracy too soon, so turn off the intelligent solution control and run it to a higher amount of the iterations. The good lift force value from simulation requires very good and fine mesh with offset mesh around the object and after the object. You could also use the Mesh adaptation function to compare the results.

Best Regards,

Karol

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I'll ask you questions about downforce and mesh.

Re: I'll ask you questions about downforce and mesh.