I think that NUMMODES should actually be set to order+1, so to run your simulation at order 1, you need to set NUMMODES=2. This seems to be confirmed by the final paragraph of the pre-processing section of the advection-diffusion tutorial (take a look at the very end of that page where it shows the set up of the expansions).

I note that in the files you’ve provided, you have NUMMODES=1. I tested running with your configuration and can reproduce the problem - the simulation crashes when NUMMODES=1 and runs when it’s set to 2.

I may be wrong here so maybe someone else with more experience of setting up simulations can correct me if that’s the case but I suspect this could be the cause of the problem you’re seeing.

On 7 Oct 2022, at 19:01, Kumar, Varun <varun_kumar2@brown.edu> wrote:

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Hello,

I am comparing the simulation results for different Polynomial orders for compressible flow over a NACA airfoil. However, it appears that for order=1, the simulation crashes immediately with the error log attached here. I also attach the mesh and sessions file in the ZIP folder for reference.

Any insights into this would be greatly appreciated.

--
Varun Kumar

Doctoral candidate (Engineering)
170 Hope St
Brown University
<CFS_NACA.zip>_______________________________________________
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