Best Of
I got an email from Free Altair Student Edition but can't download the program from the link in the email pls help
Evan Ch
Re: Resource "Limit:<username>_setname_<limitcount>" remains in system forever, how to make it expire after certain # of days?
From what I understand, the answer is no, we don't have what you were looking for because it's created on the fly. What can be done is to run a vovcron/liveness that runs “vovforget -oldlimits” on a daily basis. This was what other customers had done and it worked well.
Cary Wei
Re: How to peform FEA on Triangular Mesh derived from an Implicit model?
To run analysis on triangular mesh parts you need to choose the SimSolid solver. That is under File/Preferences/Inspire/RunOptions.
To control the faces generated during the conversion to triangle mesh you can adjust the break angle under File/Preferences/Inspire/Modeling Space /Discrete Modeling.
You can see in this example the break angle was reduced to avoid merging the fillets and flat faces.
Re: How do I access DCONADD through Hypermesh interface? I am trying to run optistruct optimization while turning on/off certain responses & constraints.
You could od this 2 ways, at least:
The the optimization view/browser to create and manage different optimization problems/scenarios, with different constraint sets.
Or using the Entity State Browser to activate/deactivate export of your constraints.
How to reduce penetration
Hello,
May I ask your favor regarding contact and reaction force?
1. Regarding contact (penetration)
1-1) I am solving excavator model which is passing over blocks. As you can see in below picture (section cut view to see penetration) there are several penetrations. I solved several times by changing contact stiffness K (F=K*z^exp) but those were not worked properly. I tried within 1000~3000 for K and time step 0.0005~0.0003 (too long solving time if use 0.0001). Can you advise me how to reduce penetration?
1-2) As you can see in picture in below right, too much penetration was made for 0.01 second. There are around 50 sub steps between 4.94 and 4.95 second. And average step size is 2.44E-5. Should I reduce step size more? or is there any reason and countermeasure for this kind of result?
1-3) I saw Advanced option panel for contact in MotionView. Is this helpful to resolve above problem? I tried with checking them but I was faced an error. Could you explain me the function of the option? or Could you let me know the link describing detail explanation?
2. Reaction force
I am comparing Roller's reaction forces between test and simulation. Reaction force by simulation is 2 or 3 times higher than that of test. All parts are composed by rigid body, including ground. Length of ground is around 30m and I installed bushing(3E5N/mm for translational, 1E15N/mm for rotational) on the ground to reduce reaction force but it was not enough to reduce reaction force (ground deflect too much if use weaker bushing). Do you have this kind of experience? and could you share the experience how did you resolve this kind of problem (very higher force than real)?
Thank you and Merry Christmas & Happy New Year.
Re: Thermal modelling in Flux - Questions from a beginner
Hello Melih,
About your last request, you will find the example "Brushless IPM motor - thermal analysis" here: https://help.altair.com/flux/Flux/Help/english/UserGuide/English/topics/Examples2D_en.htm
The same example is also available from the Flux Supervisor; it explains the difference between steady state and transient computation. Models and related documents are also available.
Please, update the FluxMotor version if you have the opportunity to do it, version 2023 is available on our website.
Best regards,
Letizia
Re: Thermal modelling in Flux - Questions from a beginner
Hello Melih,
Below you will find answers to your questions.
1. Normally, these losses are computed within FluxMotor so you can take these values from the results you obtained from the working point computation.
2. with the "static thermal model you will have the Steady State application in the model, that means that you will find the steady state temperatures.
3. Yes, there is no automatic export for the transient thermal model.
You could export the "static model" and easily convert the application to transient directly in Flux: [Application --> Convert current application--> to Transient Thermal].
Please remember to add the "volumetric heat capacity" to the materials.
Best regards,
Letizia
Re: Altair Inspire® Challenge #6: Lilly Pad Optimization
Dear sir,
I have done optimization of Lilly pad in three different ways (by changing manufacturing constraints, and optimization settings). please check the results
how to set crontab for vovnotifyd for monitoring
Hi,
If we go 3 months without using vovnotifyd daemon , this daemon goes down and we need to start manually and then kick off a run using the mail notification –
Is there any way we could have a crontab monitoring the nc setup to check for that daemon every so often?
Regards
Pavan