- Nektar-users - imperial.ac.uk

Mesh Convert Problem
by Kamil ÖZDEN 18 Jul '14

18 Jul '14

Dear All, I'm trying to generate an .xml file from the .msh file attached which I got from Gmsh. But when I tried to do that such an error come to the screen: What may be the reason for this error? Regards, Kamil

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Gmsh and boundary conditions
by Kamil Ozden 07 Jul '14

07 Jul '14

Dear All, As far as I understand Gmsh only creates the geometry and the mesh. How can we define the boundary conditions, solver info's etc. to the Nektar's xml file? Do we manually write it into the .xml file or is there another way to do this? Regards, Kamil

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Nektar++ and Mesh Generators
by Kamil Ozden 02 Jul '14

02 Jul '14

Dear All, I'm a new Nektar++ user and I want to use it in my PhD thesis which is about stenosed arteries. I want to learn that is it possible to generate mesh with mesh generators other than Gmesh like ICEM CFD, Ansys Workbench Mesher with .msh extension to get .xml file of Nektar++? Regards, Kamil

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Questions About Turbulent Pipe Flow Quasi-3D Tutorial
by Kamil ÖZDEN 02 Jul '14

02 Jul '14

Dear All, I have some questions about Turbulent Pipe Flow Quasi-3D Tutorial: * When I run this tutorial with DELL Workstation with 12 core the analysis finished at 335000th time step but in the xml file it is written that NumSteps=2000000. Is this a random number or is there a way to calculate this number of time steps? * In this problem Quasi-3D approach is used but there is no information about the length of the pipe. At first I thought this is a periodic problem but there is also no periodic boundary condition in the xml file. Can you please clarify this point? o Moreover, when I converted the last *.chk file to Tecplot's dat file I only see the front face of the pipe (2D) how can I add the third dimension to see the contours in 3D as shown in the link below: + http://www.nektar.info/wiki/3.4/UserGuide/Examples/IncNavierStokesSolver/Tu… o Is it possible to use Quasi-3D approach for all axisymmetric geometries like constricted 3D pipe as below: * In the Geometry it is said that D=1. Is it unitless otherwise what is its unit mm or meters? And finally regardless of the tutorial I want to ask that: * Is it possible in Nektar++ to use the solution of a mesh as an initial condition of another mesh? Regards, Kamil

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Nektar++ and Two-way flow simulations
by Kamil ÖZDEN 01 Jul '14

01 Jul '14

Dear All, Is it possible to held a two-way flow simulation (to describe both inlet and outlet in a simple boundary) with Nektar++? Regards, Kamil

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1D DG updates
by Chris Cantwell 18 May '14

18 May '14

Dear all, The fix/PulseWave branch, which contained updates to the 1D DG code was merged today. While the regression tests pass on all the buildbots, please make us aware of any problems as this was a substantial merge. Cheers, Chris -- Chris Cantwell Department of Aeronautics Roderic Hill Building Imperial College London South Kensington Campus London SW7 2AZ Email: c.cantwell(a)imperial.ac.uk www.imperial.ac.uk/people/c.cantwell

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Spherigon fixes
by David Moxey 18 May '14

18 May '14

Dear all, Since a number of you are using the spherigon pre-processing filter inside MeshConvert, this is just a quick note to say that a bunch of fairly long-standing bugs have now been fixed for both the 2D and 3D implementations, and that you can now specify multiple surfaces to deform at the same time by doing e.g. MeshConvert -m spherigon:surf=1,3-5,7 input.msh output.xml Please let me know if you encounter any problems. Cheers, Dave

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FieldConvertInterpPoints
by Sherwin, Spencer J 08 May '14

08 May '14

Hi, I have added a feature to FieldConvert which allows you to specify a serial run that acts as if it is a single partition of a parallel run. This is hopefully useful for processing large files for example when interpolating one mesh to another. I have put some instructions under http://www.nektar.info/wiki/3.4.1/UserGuide/Tutorial/FieldConvert Cheers, Spencer. Spencer Sherwin Professor of Computational Fluid Mechanics, Department of Aeronautics, Imperial College London South Kensington Campus London SW7 2AZ s.sherwin(a)imperial.ac.uk +44 (0) 20 759 45052

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Boost 1.55
by Chris Cantwell 26 Apr '14

26 Apr '14

Dear all, The default version of Boost installed by Nektar++ if THIRDPARTY_BUILD_BOOST is selected has been updated from 1.49 to 1.55. Other versions of Boost installed locally should still work and users who do not use the THIRDPARTY_BUILD_BOOST option should be unaffected. As always, please log a ticket if you encounter any problems, providing as much detail as possible. Cheers, Chris -- Chris Cantwell Research Fellow National Heart & Lung Institute Imperial College London South Kensington Campus Room L57, Roderic Hill Building, Department of Aeronautics London SW7 2AZ Email: c.cantwell(a)imperial.ac.uk www.imperial.ac.uk/people/c.cantwell

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Tetrahedron bug
by David Moxey 31 Mar '14

31 Mar '14

Dear all, Apologies for the spam, but just wanted to give a quick notification for anyone running curvilinear tetrahedra. I have noticed that at sufficiently high order (NUMMODES > 10) the code crashes with a memory corruption error. This is due to an incorrectly sized workspace as outlined in the bug report (http://www.nektar.info/ticket/136) Since this is unlikely to affect anyone in the short term, the workaround in the report should temporarily fix the issue until a more permanent solution is found. Thanks, Dave

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