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.

Hi Bibhas, For fun, here is a response from ChatGPT agent, Nek5000 Assistant (https://chatgpt.com/g/g

Dear community, This is a boundary layer treatment problem for a wavy or sawtooth-shaped mesh, as

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, I'm glad you figured out and have a working version. However, I'm still curious what

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

Hi, For fun, I set up a customized ChatGPT agent last week called Nek5000 Assistant. It's

Thank you, Recompilation seems to have nailed it. Best guess is that it was a library mismatch. Thor

Hi, You can overwrite the value of nmxt inside usrdat2 like this ifield = 2 nmxt(ifield-1) = 900 !

Thank you. It seems that there is a problem with the downloading the essential files: --2025-08-19 20

I am a bit unclear about the requirement of stress formulation (SF) for cyclic boundary conditions (

Hi all, To everyone who might find this thread in the future and wonder what the problem was: It was

Hello All, I am carrying out a flow simulation on an airfoil and am working on post-processing the

My guess is, you didn't create a post_reader_work in the .usr file? vx, vy, vz and pr are

Hi Bharathwaj, The size of a typical checkpoint file is E * lx1^ldim * Nfld * (4 bytes per float) +

Upgrading to a newer GCC fixed this for me, but the suggestions above did not work. On Saturday,

Hello NEK5000 Users and developers I am facing an issue on parallelizing the code and have found that

Hi Michael, I am not an expert on this, but one possible workaround might be to define two adjoining

I tried to use call setvert2d(glo_num,ngv,lx1,nelgv,vertex,.false.) but it give me many wrong number.