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.

Update: after some tweaking, I have managed to use preNek to set the periodicity in the genbox-

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

Dear Nek community, I have performed a slight modification into the original avg_all() subroutine, in

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.

Hi Bibhas, You can manually call subroutines that solve the Helmholtz (or Poisson) equation. I

Hey all, Another reminder about the upcoming July 21st priority deadline, please submit your

Many thanks, Philipp, for the helpful information! I revisited the relevant part of the code and

Hello Nek5000 users Lately, I have been working on few examples to learn NEK5000. In those case, I

Hello all, I am relatively new to NEK5000, but have learnt the basic configuration on running a case

Dear Neks, I have some questions related to the mass matrix update in ALE, and char_conv. We update

I see. So for igeom=1, the term: \sum_q^k \beta_q * u(tq), q=k,...1 is computed. and then we update

subroutine userf(ix,iy,iz,eg) ! set acceleration term c Note: this is an acceleration term, NOT a

I am setting up a new problem. why it alway complain about " no rea" file. I nenerate re2

I want to control the output of "avg_all", could you please tole me thow to set it. the