November 2011 - Nek5000-users - mailman3.cels.anl.gov

Meshing complex geometries
by nek5000-users＠lists.mcs.anl.gov 07 Nov '11

07 Nov '11

Dear Neks, I have been using Nek5000 previously to compute global stability of flows in relatively simple, plane 2D geometries. Now I am considering the possibility to use Nek5000 for a rather complicated 2D axisymmetric geometry. The flow is an axisymmetric jet with small co-flow outside. What is complicated is that I want to include the nozzle prior to the actual jet outlet. The nozzle should be converging, and contain an inner flow stream (jet flow) and an outer flow stream (co-flow), separated by a solid wall. We have an experiment in a similar geometry. I thought that a good way to find out whether this works in Nek5000 or not is to try it. So, my question is very basic: What would be a good way to to proceed, when meshing a complicated axisymmetric geometry like this? Many thanks! Outi Tammisola

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Post-processing dump files to generate Lamda-2 criterion
by nek5000-users＠lists.mcs.anl.gov 03 Nov '11

03 Nov '11

Dears Neks I have used the solver to run 3D simulations for the moving cylinder problem. I have cyl3d0.f000* and enscyl3d0.f000* dump files that I need to post process in order to generate the Lambda-2 vortex criterion. Please advise how I will load my dump files and run the solver in post processing mode to apply the criterion (I see that there is subroutine lamda2(l2) in postpro.f ). I have already read the example in http://nek5000.mcs.anl.gov/index.php/Data_processing_example but it was not clear to me. Regards Sofia

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Interpolating data from unifom grid to a GLL grid
by nek5000-users＠lists.mcs.anl.gov 03 Nov '11

03 Nov '11

Hi neks I noticed that there are routines to transfer data from a GLL grid to a uniform grid in the nek folder. Is there a robust way to transfer data from a uniform grid to a GLL grid? -Navin Fogla Graduate Student Department of Mechanical Sciences and Engineering University of Illinois at Urbana Champaign MEL 1430 +1 217 721 4661 fogla1(a)illinois.edu

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