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Welcome to the Nek5000 User Group!
For new users of Nek, we suggest exploring the successor code
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Jacob Bruney
8/11/20
Minimum Viscocity
Nek users, I am trying to simulate Euler equations and need to remove or minimize viscosity. I ran
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Minimum Viscocity
Nek users, I am trying to simulate Euler equations and need to remove or minimize viscosity. I ran
8/11/20
Teng, Ming
,
Tanmoy Chatterjee
3
8/6/20
Noises in budget terms
Hello Tanmoy, Thank you for the reply. I tried refinement by increasing polynomial order and it was
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Noises in budget terms
Hello Tanmoy, Thank you for the reply. I tried refinement by increasing polynomial order and it was
8/6/20
LAYLA FOURA
,
Haoran
2
8/4/20
Visualisation of the mesh and the geometry in NEK5000
Hi LAYLA, The mesh could be visualised by .fXXXXX file generated by running your case with Nek5000.
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Visualisation of the mesh and the geometry in NEK5000
Hi LAYLA, The mesh could be visualised by .fXXXXX file generated by running your case with Nek5000.
8/4/20
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ME19B1026 SHIVA
,
hy...@anl.gov
2
Sep 2
ICEM CFD to Nek5000 quad8 issue
what error do you see ? On Tuesday, September 2, 2025 at 7:55:35 AM UTC-5 shivasa...@gmail.com wrote:
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ICEM CFD to Nek5000 quad8 issue
what error do you see ? On Tuesday, September 2, 2025 at 7:55:35 AM UTC-5 shivasa...@gmail.com wrote:
Sep 2
Pau Fradera
, …
Dillon Shaver
5
Aug 28
Problem with last scalar fields (S8/S9) looking corrupted in ParaView output
Hi Dillon, Thank you for your reply. You were absolutely right, I splitted the output in smaller
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Problem with last scalar fields (S8/S9) looking corrupted in ParaView output
Hi Dillon, Thank you for your reply. You were absolutely right, I splitted the output in smaller
Aug 28
Filipe Brandao
Aug 27
turbJet tutorial crashing immediately after dumping restart files
Hi, I am trying the turbJet case with some modifications and I am noticing that the solution always
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turbJet tutorial crashing immediately after dumping restart files
Hi, I am trying the turbJet case with some modifications and I am noticing that the solution always
Aug 27
秦志文
, …
YuHsiang Lan
3
Aug 26
discontinuous in velocity field
Hi, For fun, I set up a customized ChatGPT agent last week called Nek5000 Assistant. It's
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discontinuous in velocity field
Hi, For fun, I set up a customized ChatGPT agent last week called Nek5000 Assistant. It's
Aug 26
Thor Gjesdal
,
YuHsiang Lan
3
Aug 22
genmap fails on exo2nek-generated mesh
Thank you, Recompilation seems to have nailed it. Best guess is that it was a library mismatch. Thor
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genmap fails on exo2nek-generated mesh
Thank you, Recompilation seems to have nailed it. Best guess is that it was a library mismatch. Thor
Aug 22
ME19B1026 SHIVA
,
YuHsiang Lan
2
Aug 21
increase the temperature, velocity solver iteration
Hi, You can overwrite the value of nmxt inside usrdat2 like this ifield = 2 nmxt(ifield-1) = 900 !
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increase the temperature, velocity solver iteration
Hi, You can overwrite the value of nmxt inside usrdat2 like this ifield = 2 nmxt(ifield-1) = 900 !
Aug 21
Chunheng Zhao
,
YuHsiang Lan
3
Aug 19
co2 file in Nek5000
Thank you. It seems that there is a problem with the downloading the essential files: --2025-08-19 20
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co2 file in Nek5000
Thank you. It seems that there is a problem with the downloading the essential files: --2025-08-19 20
Aug 19
Isa Mammadli
Aug 13
Enabling stress formulation for cyclic bc?
I am a bit unclear about the requirement of stress formulation (SF) for cyclic boundary conditions (
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Enabling stress formulation for cyclic bc?
I am a bit unclear about the requirement of stress formulation (SF) for cyclic boundary conditions (
Aug 13
Nils Benedikt
,
X. Zhou
5
Aug 12
Passive scalar BC and some elements vanish if NEL > 150000
Hi all, To everyone who might find this thread in the future and wonder what the problem was: It was
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Passive scalar BC and some elements vanish if NEL > 150000
Hi all, To everyone who might find this thread in the future and wonder what the problem was: It was
Aug 12
Bharathwaj Dharani
Aug 5
Computing Wall shear stress at each point on surface
Hello All, I am carrying out a flow simulation on an airfoil and am working on post-processing the
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Computing Wall shear stress at each point on surface
Hello All, I am carrying out a flow simulation on an airfoil and am working on post-processing the
Aug 5
patil.ak...@gmail.com
,
Yu-Hsiang Lan (藍鈺翔)
4
Jul 29
Post-processing natively
My guess is, you didn't create a post_reader_work in the .usr file? vx, vy, vz and pr are
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Post-processing natively
My guess is, you didn't create a post_reader_work in the .usr file? vx, vy, vz and pr are
Jul 29
Bharathwaj Dharani
,
YuHsiang Lan
2
Jul 27
Large output files for 3D airfoil simulation
Hi Bharathwaj, The size of a typical checkpoint file is E * lx1^ldim * Nfld * (4 bytes per float) +
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Large output files for 3D airfoil simulation
Hi Bharathwaj, The size of a typical checkpoint file is E * lx1^ldim * Nfld * (4 bytes per float) +
Jul 27
Lubomír Bureš
, …
Ansh Chaube
4
Jul 24
Compilation fails with latest version of master
Upgrading to a newer GCC fixed this for me, but the suggestions above did not work. On Saturday,
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Compilation fails with latest version of master
Upgrading to a newer GCC fixed this for me, but the suggestions above did not work. On Saturday,
Jul 24
Ananth Narayan S am24d038
Jul 24
Parallel Processing Failure: Boundary condition
Hello NEK5000 Users and developers I am facing an issue on parallelizing the code and have found that
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Parallel Processing Failure: Boundary condition
Hello NEK5000 Users and developers I am facing an issue on parallelizing the code and have found that
Jul 24
Pau Fradera
,
X. G. Zhou
4
Jul 22
Output turbulent scalar fluxes
Dear Nek community, I have performed a slight modification into the original avg_all() subroutine, in
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Output turbulent scalar fluxes
Dear Nek community, I have performed a slight modification into the original avg_all() subroutine, in
Jul 22
Michael Calkins
,
Chinthaka Jacob
2
Jul 20
Graded mesh near two boundaries with genbox
Hi Michael, I am not an expert on this, but one possible workaround might be to define two adjoining
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Graded mesh near two boundaries with genbox
Hi Michael, I am not an expert on this, but one possible workaround might be to define two adjoining
Jul 20
Technical Forex
Jul 19
how to obtaint he index of each sem nodes.
I tried to use call setvert2d(glo_num,ngv,lx1,nelgv,vertex,.false.) but it give me many wrong number.
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how to obtaint he index of each sem nodes.
I tried to use call setvert2d(glo_num,ngv,lx1,nelgv,vertex,.false.) but it give me many wrong number.
Jul 19
Bibhas Kumar
,
YuHsiang Lan
2
Jul 17
poisson's equation in Nek5000
Hi Bibhas, You can manually call subroutines that solve the Helmholtz (or Poisson) equation. I
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poisson's equation in Nek5000
Hi Bibhas, You can manually call subroutines that solve the Helmholtz (or Poisson) equation. I
Jul 17
lbca...@vcu.edu
2
Jul 16
2025 Nek User Meeting - August 5th-7th - Reminder to Register and Attend!
Hey all, Another reminder about the upcoming July 21st priority deadline, please submit your
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2025 Nek User Meeting - August 5th-7th - Reminder to Register and Attend!
Hey all, Another reminder about the upcoming July 21st priority deadline, please submit your
Jul 16
Chinthaka Jacob
,
Philipp Schlatter
3
Jul 14
Issue with lhis limit when calling hpts for large number of history points
Many thanks, Philipp, for the helpful information! I revisited the relevant part of the code and
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Issue with lhis limit when calling hpts for large number of history points
Many thanks, Philipp, for the helpful information! I revisited the relevant part of the code and
Jul 14
Ananth Narayan S am24d038
Jul 14
nekmpi: Issue on parallel computing
Hello Nek5000 users Lately, I have been working on few examples to learn NEK5000. In those case, I
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nekmpi: Issue on parallel computing
Hello Nek5000 users Lately, I have been working on few examples to learn NEK5000. In those case, I
Jul 14
Ananth Narayan S am24d038
Jul 11
Solver: EHD Equations: NEK5000
Hello all, I am relatively new to NEK5000, but have learnt the basic configuration on running a case
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Solver: EHD Equations: NEK5000
Hello all, I am relatively new to NEK5000, but have learnt the basic configuration on running a case
Jul 11
Chunheng Zhao
Jul 9
ALE mass matrix update
Dear Neks, I have some questions related to the mass matrix update in ALE, and char_conv. We update
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ALE mass matrix update
Dear Neks, I have some questions related to the mass matrix update in ALE, and char_conv. We update
Jul 9
Chunheng Zhao
,
Fischer, Paul
5
Jul 9
ALE ngeom
I see. So for igeom=1, the term: \sum_q^k \beta_q * u(tq), q=k,...1 is computed. and then we update
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ALE ngeom
I see. So for igeom=1, the term: \sum_q^k \beta_q * u(tq), q=k,...1 is computed. and then we update
Jul 9
Technical Forex
Jul 7
why the temp doen't update in the userf(ix,iy,iz,eg) function.
subroutine userf(ix,iy,iz,eg) ! set acceleration term c Note: this is an acceleration term, NOT a
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why the temp doen't update in the userf(ix,iy,iz,eg) function.
subroutine userf(ix,iy,iz,eg) ! set acceleration term c Note: this is an acceleration term, NOT a
Jul 7
Technical Forex
Jul 5
EXIT: Cannot open rea file!
I am setting up a new problem. why it alway complain about " no rea" file. I nenerate re2
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EXIT: Cannot open rea file!
I am setting up a new problem. why it alway complain about " no rea" file. I nenerate re2
Jul 5
Technical Forex
Jul 2
how to set the value of iastep = param(68)
I want to control the output of "avg_all", could you please tole me thow to set it. the
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how to set the value of iastep = param(68)
I want to control the output of "avg_all", could you please tole me thow to set it. the
Jul 2
Technical Forex
Jun 28
vv+ deviate too much between different benchmark.
I have compared 5 benchmark dns dataset from web. it seems both the vv+ and ww+ deviate too much
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vv+ deviate too much between different benchmark.
I have compared 5 benchmark dns dataset from web. it seems both the vv+ and ww+ deviate too much
Jun 28
Technical Forex
,
Philipp Schlatter
2
Jun 26
why" write(*,*) nid, nelv,vx(1,1,1,1) " gives different results with 2cpus
nid is the rank (ie MPI process ID). So it seems you run on 2 ranks (0 and 1). The velocity vx(1,1,1,
unread,
why" write(*,*) nid, nelv,vx(1,1,1,1) " gives different results with 2cpus
nid is the rank (ie MPI process ID). So it seems you run on 2 ranks (0 and 1). The velocity vx(1,1,1,
Jun 26
Hussein Kokash
, …
Philipp Schlatter
5
Jun 26
Determining Sponge and Noise Parameters in KTH Framework Example
I recommend to just check in the actual code, that is probably best to figure out what it means. But
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Determining Sponge and Noise Parameters in KTH Framework Example
I recommend to just check in the actual code, that is probably best to figure out what it means. But
Jun 26