I tried to model a rocket shape that had airbrakes to increase the drag coefficient as compared to the same body without them, however, I am getting a greater drag coefficient for the second one. I can’t find any mistake in how I set up the model, could I get some help in figuring this out?
thanks for reaching out to us here in the forum.
Can you please share a link to your project here, so that we can have a look at it?
Also have you compared the force results directly?
You can also have a look at this article in order to check the setup of your coefficient result control item.
In this article, you will learn how to correctly set up simulations to assess lift and drag coefficients. Join SimScale today!
Est. reading time: 4 minutes
Thanks and best regards
I just added a link, thank you for your help.
I did review the drag coefficients page, but my confusion stems from the specific results once I have followed all the instructions there
I just had a look at your simulation, and for a steady state run please set the simulation end time to 1000.
For a steady state analysis with a delta t of 1 the End time is the number of iterations. And usually, CFD simulations need something between 500 and 1000 Iterations to reach a converged result.
You can set the End time under Simulation Control.
Please also set the write interval to 500, else a lot of results will be written, which increases the run time of your simulation.
After that, you can check the convergence of your simulation as described here:
CFD simulation is an iterative process, therefore you should always check the convergence of the results before using them.
Est. reading time: 3 minutes
Please let me know if you have any further questions.