Errors in running Comp Flow simulation with 'nummode=1'
******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* 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
Hi Varun, 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 <https://doc.nektar.info/tutorials/latest/basics/advection-diffusion/basics-advection-diffusionch2.html#x3-50002> (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. If that’s true, we should add some error checking that prints an error or warning message when NUMMODES=1. Kind regards, Jeremy
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>_______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users
Thanks, Jeremy. I read the details in the document and agree with your assessment. -- Regards Varun On Fri, Oct 7, 2022 at 2:31 PM Jeremy Cohen <jeremy.cohen@imperial.ac.uk> wrote:
Hi Varun,
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 <https://doc.nektar.info/tutorials/latest/basics/advection-diffusion/basics-advection-diffusionch2.html#x3-50002> (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.
If that’s true, we should add some error checking that prints an error or warning message when NUMMODES=1.
Kind regards,
Jeremy
On 7 Oct 2022, at 19:01, Kumar, Varun <varun_kumar2@brown.edu> wrote:
This email from varun_kumar2@brown.edu originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list <https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address.
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>_______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users
Hi Both, Jeremy is right. I think we did have an option for nummodes=1 for the compressible code but have not checked if that works recently. Cheers, Spencer Sent from my iPhone On 7 Oct 2022, at 20:49, Kumar, Varun <varun_kumar2@brown.edu> wrote: Thanks, Jeremy. I read the details in the document and agree with your assessment. -- Regards Varun On Fri, Oct 7, 2022 at 2:31 PM Jeremy Cohen <jeremy.cohen@imperial.ac.uk<mailto:jeremy.cohen@imperial.ac.uk>> wrote: Hi Varun, 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<https://doc.nektar.info/tutorials/latest/basics/advection-diffusion/basics-advection-diffusionch2.html#x3-50002> (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. If that’s true, we should add some error checking that prints an error or warning message when NUMMODES=1. Kind regards, Jeremy On 7 Oct 2022, at 19:01, Kumar, Varun <varun_kumar2@brown.edu<mailto:varun_kumar2@brown.edu>> wrote: This email from varun_kumar2@brown.edu<mailto:varun_kumar2@brown.edu> originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. 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>_______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users
participants (3)
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Jeremy Cohen
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Kumar, Varun
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Sherwin, Spencer J