Engine run not starting

Hi,

I downloaded the neon model from Altair University and tried reducing it to below 100,000 nodes to use it with a student edition.

However, I am facing an issue with the engine file. The engine run just doesn't start.

The engine run seems to begin with the Software titles and then these lines appear.

ROOT: test RESTART: 0001
NUMBER OF HMPP PROCESSES 8
14/02/2019

==== End of solver screen output ====

==== Job completed ====

I am attaching the file where I am facing this issue.

Any hint on what's wrong?

I was also trying to create a few sections. They might have gone wrong but even if I delete those problematic entities, this file just doesn't run.

Unable to find an attachment - read this blog

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Altair Forum User

In engine file /INTER is empty

Sherdil.Leo0

Hi Pooja,

Thank you for looking into this.

I tried adding details to the INTER card.

image.png.e97102eaba091128d58956b760fb0434.png

I also tried deleting the INTER card altogether.

In both cases, I am still facing the same issue.

Moreover, if INTER card was the issue, I thought I should have seen it in the Starter Output file Errors and Warnings.

Can values inside the Radioss model (material parameters) effect into this consequence? What could be the other reasons?

Simon Križnik

@Skill.Leo0

actually @Pooja S is right.

Just turn the status of ENG_INTER off, or delete it. There is no use for it in single engine run- it is used for modifying interfaces in multiple engine runs.

One reason your run failed even after deleting /INTER entry in the engine file is if you run from Hypermesh (and if ENG_INTER is still on), it just rewrites the engine file.

If you need to turn on/off interfaces, use the Tstart and Tstop on interface cards to activate/deactivate.

Try the attached solver deck. There are initial penetrations and the imposed timestep is a bit too high.

Unable to find an attachment - read this blog

Sherdil.Leo0

@Ivan @Pooja S

Thanks a lot for looking into this.

image.png.10083ca137c2c5c768900da58c784ba2.png

I tried removing and making sure that ENG_INTER is not being used. I am still facing the same issue.

I tried clearing all intersection and penetrations, still facing same issue.

I had also tried running the reduced file you attached. Even that is showing me the same issue while running it.

Running clueless. Kindly help.

Simon Križnik

This is strange. It is able to run at my end with the solver deck previously shared- check the engine out file attached (note the run was terminated manually).

Try to run the solver deck in Radioss solver:

1. Go to Start > Programs > Altair HyperWorks > RADIOSS.

2. For Input file, browse to the exercise folder and select the file

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

Unable to find an attachment - read this blog

Sherdil.Leo0

Bingo! It seems adding single precision flag made it work! Thanks a lot!

Why was it not working without it? Double precision runs were working fine so far.

Simon Križnik

Actually, there must be some other reason it did not run on your end, as I am able to with both single or double precision.

Try renaming the model file, deleting all control cards and set them up again, export the solver deck with merge starter and engine file option and then run in Radioss.

My best guess is there was still /INTER entry in the engine file that was causing the failure.

Check the attached solver deck, where contacts were modified

Unable to find an attachment - read this blog

Sherdil.Leo0

ok. I will try that.

From the comments so far, it seems this kind of issue wasn't seen ever before. I hope it doesn't have anything to do with computer configurations.

Thank you!