Inconsistent Periodic BC in Prenek
Hello Neks, I am making a rectangular domain with two sides periodic and 2 sides no-slip. I am having problems after the global refine. If I refine my domain to 48 elements, it's fine, but if I refine it to 192 elements (which is better, with a grid size =1 ), it returns "Inconsistent Periodic BCs" and "Reset el/face1". As a result the "genmap" does not work due to Periodic Mismatch. Please note that there is no problems if no. of elements = 48. I don't understand what the problem is. Any help is appreciated. Thanks for reading. Saikat Saikat Mukherjee, PhD Student, Paul Research Group - http://www.me.vt.edu/mpaul/ Engineering Science and Mechanics, Virginia Tech.
Hi all, I modified the case turbChannel into turbulent boundary flow, of which the inflow boundary condition is 'v ' and the outflow boundary condition is 'O '. For the inflow boundary condition, I wonder can I get it from velocity time history files, just similar to the restart case that gets initial condition from defined file? I tryied a lot, and find for parallel computing the subroutine userbc is invoked randomly. The major subroutine function for inflow boundary may be subroutine faceiv (cb,v1,v2,v3,iel,iface,nx,ny,nz). I have no idea how to deal with it from time history files. Can anybody help me or give me a simple example? Best regards! Hu
Hi Saikat, If you're doing this in prenek then the likelihood of having the periodic bcs retain correct numbering is very low. I would suggest to build the mesh in genbox and you can then prescribe the BCs (along with precise coordinates of the array of elements). Otherwise, the standard procedure is to edit the .rea file and replace " P " with " " (3 blanks), then go into prenek and when it prompts for BCs click: SET ENTIRE LEVEL PERIODIC AUTO .... which should produce what you need. Paul ________________________________ From: [email protected] [[email protected]] on behalf of [email protected] [[email protected]] Sent: Sunday, April 09, 2017 5:39 PM To: [email protected] Subject: [Nek5000-users] Inconsistent Periodic BC in Prenek Hello Neks, I am making a rectangular domain with two sides periodic and 2 sides no-slip. I am having problems after the global refine. If I refine my domain to 48 elements, it's fine, but if I refine it to 192 elements (which is better, with a grid size =1 ), it returns "Inconsistent Periodic BCs" and "Reset el/face1". As a result the "genmap" does not work due to Periodic Mismatch. Please note that there is no problems if no. of elements = 48. I don't understand what the problem is. Any help is appreciated. Thanks for reading. Saikat Saikat Mukherjee, PhD Student, Paul Research Group - http://www.me.vt.edu/mpaul/ Engineering Science and Mechanics, Virginia Tech.
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