Nek5000

Nek users, I am trying to simulate Euler equations and need to remove or minimize viscosity. I ran

Hello Tanmoy, Thank you for the reply. I tried refinement by increasing polynomial order and it was

Hi LAYLA, The mesh could be visualised by .fXXXXX file generated by running your case with Nek5000.

I am facing similar issue here. I have a 2D mesh created with gmsh with only 3 boundary IDs: 1- inlet

Hi, you need to add an sink or source to your energy equation. So you are solving temperature variant

Dear Chunheng, The code below (also included as attachment) shows how to compute a surface integral

It works when adjusting the header of the .re2 file. However when doing the same for a 3D mesh, it

Dear YuHsiang Lan Thanks for your answer, it really helps. Student Ma On Monday, December 8, 2025 at

Dear Haomin (Kirk) Yuan Thanks for your answer, it really helps. Student Ma On Thursday, December 4,

Hello, I have been trying the k-tau RANS model on a 2D flat plate geometry with boundary conditions

Hi Yu-Hsiang, Thank you very much for your response. I checked the BCs, and the .rea file generated

Hi everyone, Just in case anyone stumbles upon this thread in the future wondering how to resolve

Hello everyone in the community, I ran a simulation for a while and finally obtained foo0.f00100. I

Thank you for reminding me. I actually tried adding "-mcmodel=large" into PPLIST (makenek)

Dear community, Within a numerical simulation framework based on the Immersed Boundary Method (IBM),

Thank you very much. On Sunday, October 26, 2025 at 11:24:06 PM UTC+8 YuHsiang Lan wrote: Hi, I'm

Hi YuHsiang, That's interesting. Thanks for suggesting. That's helpful. Best, Bibhas On

Dear Bastien Thanks for your answer, it really helps. Student Ma On Friday, November 14, 2025 at 5:32

Dear Nek community, I am a newcomer to Nek5000. I would like to ask for some guidance on how to set

Hi all, I tried modifying the font settings in xdriver.c as suggested in previous discussions (

Hi! I'm currently generating a geometry where the circle size depends on its radius. I plan to

Hi Neks, I have a Jacobine error from my simulation. It is not always there. Sometimes, it runs fine,

Dear Community, I wanted to remind about this message I sent a while ago. I would greatly appreciate

Hi Bastien, Because you are using full_restart, if_full_pres is turned on. Otherwise, it's off by

Hi, Can you provide the equations you are solving? Do you also modify the matrix for the pressure

Hi, I am working on a simaultion my local system with 13 core and 10 iteration per min I am getting.

Hi. It is suggested to upload your build.log or screenshot that indicates errors. I think it would be

Hi Thor, Glad to hear that you managed to assign the periodicity through Prenek and are making

Hi, What are the tolerances you have for the linear solvers? The default tol are designed for the

Correct. bm1 is the diagonal mass matrix on "mesh 1" (the velocity mesh on the GLL points)

what error do you see ? On Tuesday, September 2, 2025 at 7:55:35 AM UTC-5 shivasa...@gmail.com wrote:

Hi Dillon, Thank you for your reply. You were absolutely right, I splitted the output in smaller

Hi, I am trying the turbJet case with some modifications and I am noticing that the solution always