CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Simulation terribly slow

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By Zigec

LinkBack Thread Tools Search this Thread Display Modes
Old   May 15, 2019, 09:05
Unhappy Simulation terribly slow
New Member
Join Date: Nov 2015
Posts: 6
Rep Power: 10
mahendrark is on a distinguished road
Hello guys,

I'm running a 2D simulation of a flat plate solar thermal collector with 130k cells in the mesh. There is natural convection involved.

Now, the system is a workstation with 256 GB RAM, 28 cores and ANSYS academic research license.

My huge problem is the simulations are running super slow! Same with the meshing. In the task manager, the CPU is never used more than 20%. I have tried setting the prioroty of the ANSYS tasks as 'high' to no avail.

Please help me. I have many design points and different cases. At the current rate of simulation speed, it will take me a LONG time to finish the simulations.
mahendrark is offline   Reply With Quote

Old   May 15, 2019, 13:59
New Member
Join Date: Feb 2016
Location: Maribor, Slovenia
Posts: 27
Rep Power: 10
Zigec is on a distinguished road
Send a message via Skype™ to Zigec
Did you select parallel?

In CFX you do it when you open the solver, just change from serial to MPI local or something else. In Fluent you need to do this the moment the first windows pops up.

Meshing is by default only on 1 core, but there is also on the left side of the window, where all the settings for meshing are, an option to choose more cores (I think it is in advance settings or something like that).
vivjk94 likes this.
Zigec is offline   Reply With Quote


ansys, fluent, heat transfer, simulation, slow

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fluent running increadibly slow MayTheFlowBeWithYou FLUENT 12 May 22, 2018 02:04
Parallel simulation on STAR-CCM+ 11.06.010-R8 Hosseinmgh_chemeng Siemens 1 August 30, 2017 08:21
Surface Source - Fixed Temperature? robtheslob FloEFD, FloWorks & FloTHERM 18 May 12, 2017 02:28
Simulation FPEs - turbulence for transient and steady-state? DaveR OpenFOAM Running, Solving & CFD 5 March 5, 2017 15:06
Ultra slow convergence velocity in the simulation demigod FLUENT 1 October 5, 2005 08:03

All times are GMT -4. The time now is 17:48.