- Nektar-users - imperial.ac.uk

Expansion Types and IncNavierStokesSolver
by Kamil Ozden 28 Sep '14

28 Sep '14

Dear All, I searched the web site of Nektar++ but I couldn't find any detailed information about the EXPANSION types (MODIFIED, GLL_LAGRANGE & GLL_LAGRANGE_SEM) used when using IncNavierStokesSolver. What are the differences between these Expansion types? Which one of these expansion types is the most suitable for problems like pipe flow or blood flow in vessels etc. ? Regards, Kamil

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Does FieldConverts interppointdatatofld module do 3D?
by Kilian Lackhove 28 Sep '14

28 Sep '14

Dear All, i am trying to convert a 3D .pts file to a .fld file using FieldConverts "interppointdatatofld" module. Is that possible? What would i need to specify for the interpcoord option then? I also found a typo in FieldConvert. This is the MR: http://gitlab.nektar.info/nektar/merge_requests/389 Cheers, Kilian PS: I am currently running: ~/code/nektar/utilities/PostProcessing/FieldConvert/Tests # FieldConvert -v -e -m interppointdatatofld:interpcoord=3 chan3D.xml chan3D_pts.pts chan3D_pts.fld with the file chan3D_pts.pts containing: <?xml version="1.0" encoding="utf-8"?> <NEKTAR> <POINTS DIM="3" FIELDS="p"> -1.0 -1.0 -1.0 1.0E5 -1.0 -1.0 1.0 1.1E5 -1.0 1.0 1.0 1.2E5 -1.0 1.0 -1.0 1.3E5 1.0 -1.0 -1.0 1.4E5 1.0 -1.0 1.0 1.5E5 1.0 1.0 1.0 1.6E5 1.0 1.0 -1.0 1.7E5 </POINTS> </NEKTAR> but that doesnt seem to work. -- Kilian Lackhove, M.Sc. Fachgebiet für Energie- und Kraftwerkstechnik L1|08 114 Technische Universität Darmstadt Jovanka-Bontschits-Straße 2 D-64287 Darmstadt Germany Tel.: +49 6151 16 - 5186 Fax: +49 6151 16 - 6555 e-mail: lackhove(a)ekt.tu-darmstadt.de

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The grid using GLL expansion type
by Kamil Ozden 18 Sep '14

18 Sep '14

Dear All, When I specify my expansion type as GLL_LAGRANGE or GLL_LAGRANGE_SEM, I see in the grid that the spectral elements are divided in an equispaced way. As far as I know, for GLL expansions the grid should be divided as getting finer through the edges. Is there any other way that Nektar++ handles this issue? Regards, Kamil

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Problem about writing .his file
by Kamil ÖZDEN 30 Aug '14

30 Aug '14

Dear All, I want to get data from several points during my analysis at every 100th time step with the following parameters but Nektar did not write any .his file during the analysis. What may be the problem about this? Regards, Kamil

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Re: [Nektar-users] Nektar++
by Mike Kirby 27 Aug '14

27 Aug '14

Hi - I am traveling, but have forwarded this to the user list. Several group members should be able to help out. Thank you for your interest in nektar++! Cheers, Mike PS: Chris — you may want to see what is up with the contact form. thx. —mk On Aug 26, 2014, at 12:53 PM, S.J.M. Kok <s.j.m.kok(a)students.uu.nl> wrote: > Dear mr. Kirby, > > I sent you this mail regarding Nektar++, because the contact form seems to be broken.. > > Recently, I found the Nektar++ software you are a project leader for. It looks promising! However, I've already been trying for two days to successfully build the project. I've tried the 3.4 and the 3.3 versions with a large number of options and tweaks (of course I've tried following the user guide to the letter, with the exception that I'm using VS2010). Unfortunately, I keep getting linker errors of some sort. > > I have no idea what could be wrong. I'm assuming you have plenty of other things to do, so is there maybe a forum or someone you could refer me to? > > Best regards, > Selmar ---- R.M. Kirby Professor, School of Computing and Scientific Computing and Imaging Institute University of Utah

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Periodic Boundary Condition for Pipe Flow
by Kamil Ozden 24 Aug '14

24 Aug '14

Dear All, Is it possible to define periodic boundary condition for pipe flow in Nektar++? If yes, may I succeed it by specifying a pressure gradient in axial direction of pipe? Regards, Kamil

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Different Element Types
by Kamil ÖZDEN 30 Jul '14

30 Jul '14

Dear All, Is there any way to generate a problem in Nektar++ with a mesh including different element types (quads+hexas+prisms etc.)? Regards, Kamil

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Different Element Types in a Mesh
by Kamil ÖZDEN 29 Jul '14

29 Jul '14

Dear Dr. Comerford, For Nektar to solve a problem, do I have to generate the mesh with a single type of element? Because, when I try to convert a mesh (which is the combination of different type of elements quads+hexas+prisms) like the one below to an .xml file via MeshConvert, I'm getting such a warning message: *"Different Types of Elements in Same Composite".* I have to define the whole body as a single volume to solve my problem. Is there any way to define different types of elements in a single composite? Regards, Kamil

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MeshConvert Problem
by Kamil ÖZDEN 24 Jul '14

24 Jul '14

Dear All, I generated the mesh below in Gmsh by generating three volumes and defining them as a single physical volume. Then I tried to convert it to .xml by using MeshConvert, it did but I got the following messages. After that by using this .xml file I tried to convert it to .vtu file in XmlToVtk executer. However, I got warning messages like below and the following mesh in Paraview . Moreover when I tried to open the .dat file by using XmlToTecplot, Tecplot says "Aspect ratio exceeds ratio limit. The ratio has been just adjusted." and "Axis Mode has been reset to be XYDependent" and got the following view. Do you know how can I solve this problem? I'm sending the .msh and .xml files in the attachment. Regards, Kamil

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Does Nektar++ support neighbor elements with non-matching faces
by Cuneyt Sert 22 Jul '14

22 Jul '14

Hi, Does Nektar++ support neighbor elements with non-matching faces? Such as one big face connected to multiple smaller faces with hanging node(s), which may be obtained after a mesh adaptation. Or a mesh with multiple structured regions with non-matching interfaces? Cuneyt

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