July 8, 2021 at 11:00 amBabethSubscriber
I don't know if it's the right place for this question, but I didn't know where to post it.
I have a free 2021R1 version in my laptop, and I have done all my project with it. But as my computer is not powerful enough (calculation time is huge), I need to run my project on a more powerful computer in my laboratory. But this computer has a 2020R2 version. So can I just save all my project in an earlier version using the workbench ?
ElisabethJuly 8, 2021 at 12:43 pmpeteroznewmanSubscriberUnfortunately, there is no easy way to save a project to an earlier version. You have to build the model from scratch, sorry.
Are you using Explicit Dynamics? That calculates a time step that can be tiny and result in long solution times. For example, if the solver estimates that it will take 300 hours on your laptop because the time step is 1e-7 seconds, that same time step will be present on the lab computer. What is the clock speed of your laptop? You will find the lab computer clock speed is not going to be much faster than your laptop (it may even be slower), it is certainly unlikely to be twice as fast and even if it was, that is still 150 hours of solution time, which is intolerable.
What you need to do is make changes to the model to increase the time step from 1e-7 to 1e-6. then the model will take only 30 hours on the laptop computer.
Here are some changes you can make to your Explicit Dynamics model to make it solve in less time. You can edit the density of the material to artificially reduce the time it takes to solve. For example, if you multiply the density by a factor of 25, the solution will take 1/5 of the time to compute the solution.
Another change is to increase the minimum element size. Look at the Mesh Metric called Characteristic Length. If you can increase the minimum length by a factor of 4, the solution will compute in 1/4 of the time.
If you do both those things, the solution will take 1/20 of the time to compute. Now that 300 hours becomes 15 hours on the laptop, which is tolerable.
None of the above applies to Transient Structural models, which use a completely different solver.
July 8, 2021 at 1:00 pmRobAnsys EmployeeJust to add to comments. The Workbench session can't be saved in an earlier version. However, some of the solver files may be exported and read into an older version: it's not recommended and you will need to check all the settings but it may be possible. Check what export options you have in the solver and see how you get on.
Doing it again will be safer, probably easier and good practice with the software.
July 8, 2021 at 3:40 pmBabethSubscriberYes I'm working on Explicit Dynamic.
The main problem is that my geometry is relatively complex... I'll try to just import the .scdoc from my version to the 2020 version, I hope this works. The clock speed of my computer is 2GHz, and my computer has just an i3 processor, whereas the lab computer has an i7 or i9... Also, I think that a change of the density will distort my results... but I'll try to increase the time step and to decrease the number of elements.
Thank a lot Regards Elisabeth
July 8, 2021 at 4:05 pmRobAnsys EmployeeIf scdoc fails to transfer the Step (stp) format will pass across as its generic. I'm not sure that's available in Student though. If not, you may need to install a newer build on the lab computer.
July 8, 2021 at 6:40 pmpeteroznewmanSubscriberYes, high density can alter the results. The idea is if you need to run to model many times to find many mistakes, you find the mistakes much faster. Once all the mistakes have been found, you set the density back to normal and wait the longer time for results, then you can see the effect of the high density by comparing with the previous, mistake-free solution.
Viewing 5 reply threads
Ansys Innovation Space
- You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from life-saving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.Trending discussions
- Limitations to Student License?
- Missing Analysis Systems from toolbox
- Not seeing any items in the ANSYS Workbench toolbox?
- ANSYS License Manager Error
- “An error occurred while starting the solver module.” – Maybe licence problem?
- FLUENT application Failed to start
- Please recommend the configuration of the computer workstation
- No license available at this time
- I am using MacBook Pro with M1chip, how can I install or any other ways to use Ansys ?
- Problem with ANSYS 18.2 SpaceClaim
Top Rated Tags
© 2022 Copyright ANSYS, Inc. All rights reserved.Ansys does not support the usage of unauthorized Ansys software. Please visit www.ansys.com to obtain an official distribution.