Ansys Mechanical HPC + Acoustics ACT

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rcn1990 posted this 4 weeks ago

Dear Sir/Madam,

I have been working with Ansys Mechanical (not APDL) to do acoustic simulations with the acoustics ACT for a little while now . I use Ansys 18.0 and the Ansys 18.0.2 Acoustics ACT.

On my own system everything has been working perfectly fine. As I have less time left and would like to do simulations for higher frequencies, I tried to do the acoustic simulations on the HPC/LSF10 of my university. Regardless of whether I loaded the Acoustics ACT or not, when I open the Design Modeler or Ansys Mechanical, there seems to be something going on with the graphics: My geometry is flickering in the viewer, when I hover with my mouse over the geometry it disappears and the boundary conditions, which I have set up before during the simulations on my own system, are somehow not recognised. Even though I have selected faces for the boundary conditions, and in the graphics view the faces are colored blue, the boundary conditions still have a question mark ''?'' next to them in the tree on the left instead of an OK mark.

I have done a little digging and it might be how the HPC/LSF10 environment is set up, how Ansys Mechanical is launched from workbench and something with the shared libraries. I thought of starting Ansys Mechanical right away (not APDL), but I can't find out what the command for that is and if I was able to do so, how I would load the Acoustics ACT. Do you perhaps know what the problem is and how I can do the acoustics with Ansys on the cluster?

Best regards,

 

R

PS. The same problem is observed whenever Ansys Mesher is opened.

 

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peteroznewman posted this 4 weeks ago

Dear R,

I described how to go about some baby steps to demonstrate the possibility of running a job on a cluster in this discussion. The idea is to do all Pre and Post processing on your PC and only call the solver on the HPC cluster with a single command line.

The ACT is just for your PC to have Mechanical provide a user interface to make writing an input file that has the proper commands in it to describe an acoustics model.

The solver can digest that input file and doesn't need any ACT installed to solve it.

Kind regards,

Peter

 

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rcn1990 posted this 4 weeks ago

Dear Peter,

Thank you for your reply. I am wondering what the launch command of the Ansys Mechanical  is then (which is not the Mechanical APDL's )?

I have everything set up on my local machine already, so now it would just be a matter of making a journal and sh file with all the required information.

Kind regards,

R

peteroznewman posted this 4 weeks ago

 Dear R,

The attachment to that post has an example of a command line to start the solver.

"c:\Program Files\ANSYS Inc\v172\ansys\bin\winx64\ansys172.exe" -b -np 10 -i input.dat -o solve.out

Just customize that command to the installation details of ANSYS on the cluster. The -np  flag tells the solver to use 10 cores.

Kind regards,

Peter

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rcn1990 posted this 4 weeks ago

Dear Peter,

Thank you very much again for your help.

I have one more question. Since I am using Fluent a lot as well, I was wondering something similar is possible with the Ansys Mesher:

Set up the mesher on a local machine, create an input file and generate the mesh on the cluster with a batch file?

Kind regards,

R

peteroznewman posted this 4 weeks ago

Dear R,

I am not a Fluent expert, but I have heard about a "Case file" so that may be equivalent to a Mechanical input.dat file.

Try posting a question in the Fluid Dynamics section.

Kind regards,

Peter

rcn1990 posted this 4 weeks ago

Dear Peter,

Is the solve.out file also the file that can be loaded into the Mechanical application by using Tools > Load Results File later on?

Kind regards,

R

Aniket posted this 3 weeks ago

You'll need the *.rst file (generally) to load from tools>read result file. Solve.out is only output file which shows the output of the commands given in the dat file.

-Aniket

 

-Aniket

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rcn1990 posted this 3 weeks ago

Thank you for the reply. It works perfectly well by solving on the cluster. However, now, when I try to edit the input files on my local machine, the problem with the excitations and radiation boundaries happens there too: I select faces, the can be seen as blue/green the geometry viewer, but there is still a question mark in the outline tree next to the relevant boundary condition or selected excitation. What is this exactly and how can I remove this?

Aniket posted this 3 weeks ago

Try clicking on the "Show Errors" button.

Show Errors button on the toolbar

Also, check all the fields in the details view of the said boundary condition are correctly filled.

-Aniket

-Aniket

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rcn1990 posted this 3 weeks ago

Try clicking on the "Show Errors" button.

Show Errors button on the toolbar

Also, check all the fields in the details view of the said boundary condition are correctly filled.

-Aniket

It says invalid loads for the error message, fixed this on my own machine, but not for the computers/clusters available at university. The problem only arises when the GUI is used there. On my local machine, I put accidently ''modal analysis'' instead of ''full''. but this seems not to be the problem this time.

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