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AMSES for large NVH model

Hi everyone,

I am trying to setup a NVH problem with AMSES solver. According to altair's solver introduction (http://www.altairhyperworks.com/hwhelp/Altair/hw14.0/help/hwsolvers/hwsolvers.htm?solvers_overview_intro.htm#amses). AMSES should be activated from CMSMETH. I am new to Optistruct. Could some one please explain how exactly the CMSMETH should be set up?

And why CMSMETH represents in load collector instead of control card?

How about SOLVTYP? please explain how to set up SOLVTYP as well, if may.

Thanks

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Altair Forum User

Hi @Frehab

I am attaching a sample file AMSES+CMS.

nd why CMSMETH represents in load collector instead of control card?

I will check and will let you knwo about it.

How about SOLVTYP? please explain how to set up SOLVTYP as well, if may.

Do you want to change the solver method?

Unable to find an attachment - read this blog

Altair Forum User

@Prakash Pagadala

Yes, i would like to know more about SOLVTYP and how to change the solver method.

Altair Forum User

@Prakash Pagadala

One more question about the AMSES. After creating the eigra and the cms in the load collector, is there any other operation need to take before set it to run? I have my program on running for 9 hours...it doesn't seems right to me.....

Altair Forum User

Hi @Frehab

There are two categories, Direct solver and iterative solver and several types are categorized under these like MUMPS (direct solver), PCG(Iterative), etc...

You can add/change solver through SLOVTYP which is available through load collectors.

You can refer to SOLVTYP card on OptiStruct user guide for more information.

Altair Forum User

One more question about the AMSES. After creating the eigra and the cms in the load collector, is there any other operation need to take before set it to run? I have my program on running for 9 hours...it doesn't seems right to me.....

No, no load case or such has to be defined.

If possible share the model, please.

Altair Forum User

@Prakash Pagadala

Sorry, I am not allowed to share the model. But here is how I set it:

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Hi,

How many does your model contain?

I think due to optimization the run is taking long.

Can you check if it is the same with analysis only (without optimization)?

Altair Forum User

@Prakash Pagadala

I changed it to analysis only later. It works now. Yes, you are right. Optimization is too big to run. This model contains about 3 million elements.

Thanks again