August 2022 - Nektar-users

Mapped boundaries
by Marc Goldbach 11 Aug '22

11 Aug '22

******************* 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. ******************* Hi All, I would like to sample data from a plane within my domain (turbulent channel), and use those values as the inlet boundary. The plane at which data is sampled is in the middle of the domain, so a periodic boundary is not suitable. Is this possible, and if so how can I do this? So far I have looked at using the "HistoryPoints" filter to extract data from the simulation along a plane, but I cannot quite figure out how to read the time dependent boundary data from file: 88 <BOUNDARYCONDITIONS> 95 <REGION REF="0"> 96 <D VAR="u" FILE="periodicInlet_"/> 97 <D VAR="v" VALUE="0" /> 98 <D VAR="w" VALUE="0" /> 99 <N VAR="p" USERDEFINEDTYPE="H" VALUE="0" /> 100 </REGION> ... 185 </BOUNDARYCONDITIONS> ... 256 <FILTER TYPE="HistoryPoints"> 257 <PARAM NAME="OutputFile">periodicInlet</PARAM> 258 <PARAM NAME="OutputFrequency">1</PARAM> 259 <PARAM NAME="OutputOneFile">false</PARAM> 260 <PARAM NAME="plane"> 261 100, 100, 262 0, 0, 0, 263 0, 7, 0, 264 0, 0, 2, 265 0, 7, 2 266 </PARAM> 267 </FILTER> When using <PARAM NAME="OutputOneFile">false</PARAM>, the history point data is saved in files based on index (e.g. periodicInlet_0, periodicInlet_1, periodicInlet_2, etc.) Any suggestions are appreciated. Regards, *Marc Goldbach* PhD Student, Department of Mechanical Engineering University of North Carolina at Charlotte

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Re: [Nektar-users] Error in solving compressible NS equation with NACA airfoil
by Kumar, Varun 10 Aug '22

10 Aug '22

Hi James, Thanks for taking a look and for your feedback. I have looked at the session file a few times but was not able to determine if something is wrong with the definition of my boundary regions. Regarding Driver, I am using the Pre-compiled Linux package if that is what your question was. I have attached a zipped file containing the relevant file as per your suggestion. It has the original mesh file, Nektar mesh file generated from Nekmesh, and the Session file. Thanks and regards Varun On Wed, Aug 10, 2022 at 1:14 PM Slaughter, James W < j.slaughter19(a)imperial.ac.uk> wrote: > Hi Varun, > > Is there any chance you could email through the attachments as a zip or > change the extensions to .txt? Our outlook policies unfortunately block xml > files automatically so we can't download the session/mesh files to see what > might be causing the issue. > > Looking through the backtrace gives a good first hint of the error > however. The error happens in SpatialDomains when trying to initialise the > Driver Object. So would suggest its most likely a configuration error in > the session file. Either something with the composites/boundaries or a > combination of parameters that might not be available. But again, this is > just a first guess from the backtrace. Maybe look at the mesh file and grep > the composites tag and grab all the lines after that. Then make sure each > of the composites you have in in that tag are present in BoundaryRegions in > the session file. Other than that - are you using a different Driver than > default? > > If you can send through those files - someone should be able to take a > look for you. > > Thanks! > > Kind Regards, > James Slaughter. > > > > ------------------------------ > *From:* nektar-users-bounces(a)imperial.ac.uk < > nektar-users-bounces(a)imperial.ac.uk> on behalf of Kumar, Varun < > varun_kumar2(a)brown.edu> > *Sent:* 10 August 2022 17:58 > *To:* nektar-users <nektar-users(a)imperial.ac.uk> > *Subject:* [Nektar-users] Error in solving compressible NS equation with > NACA airfoil > > > This email from varun_kumar2(a)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. > > > Hi all, > > I am trying to study compressible flow over a NACA airfoil with Nektar++ > and I am seeing a Segmentation fault while running the simulation. The > steps for creating the simulation are as follows: > > 1. Create mesh in GMSH (File attached) > 2. Convert GMSH to Nektar++ compatible format using NekMesh > 3. Setup the session file as per problem statement (Session file > attached). > > [image: image.png] > I would appreciate any help that I can get with this in trying to > understand the source of this error. > > -- > Thanks > Varun > >

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Error in solving compressible NS equation with NACA airfoil
by Kumar, Varun 10 Aug '22

10 Aug '22

******************* 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. ******************* Hi all, I am trying to study compressible flow over a NACA airfoil with Nektar++ and I am seeing a Segmentation fault while running the simulation. The steps for creating the simulation are as follows: 1. Create mesh in GMSH (File attached) 2. Convert GMSH to Nektar++ compatible format using NekMesh 3. Setup the session file as per problem statement (Session file attached). [image: image.png] I would appreciate any help that I can get with this in trying to understand the source of this error. -- Thanks Varun

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Issue with restart
by Octavio Morales 03 Aug '22

03 Aug '22

******************* 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. ******************* Hi Nektar community, in your experience, is it possible to start a case from a .fld or .chk file that has already been running but for some reason something stopped it? (Maybe a blackout or some sort of inconvenience) I've used the: <Expansion> <F FILE="restartfile.fld" /> </Expansion> But it doesn't seem to work. Any info will be helpful and highly appreciated.

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