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[Workbench] How do you increase the computational speed

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Old   November 27, 2017, 06:56
Default How do you increase the computational speed
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Hi everyone;
I wonder there s some way to accelerate the computational speed.The computer work station has worked for one night,while the model process is 1%,It is too slow. Multiple nuclear acceleration is set up.
I really appreciate your help!
Thank you,
zhizhuo
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Old   November 27, 2017, 07:26
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Hi,

It depends on a lot of factors like the kind of hardware you're using, do you output results at all time steps, writing them on a ssd or hhd, are you solving in core or out of core, nb of processors, etc...

One thing that you can check is the nb of cores that you request, by default it's 2. You can change that either in Workbench, > tools > options > solution process > Default number of processors, and also under the Mechanical APDL tab > analysis > processors. Or directly in Mechanical > tools > solve process settings > advanced > max number of utilized cores.
Have fun
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Old   November 27, 2017, 07:27
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BTW, just be careful where you post the thread, this should not be in the meshing forum
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Old   November 27, 2017, 07:43
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Thank you very much for your suggestion and sorry for the mistake.you are so kind. I will pay attention to it next time.What you said setting nb of cores,I have set six .Maybe there are some other problem.
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Old   November 27, 2017, 08:07
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You should also look at the solver file output > Solution branch > solution information > solver output. You'll find a lot of useful information there.
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Old   November 27, 2017, 08:12
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Quote:
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BTW, just be careful where you post the thread, this should not be in the meshing forum
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You should also look at the solver file output > Solution branch > solution information > solver output. You'll find a lot of useful information there.
Thanks again,I will check it later
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Old   November 27, 2017, 15:22
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Go through Explicit tutorial course from the Customer portal.

Your timestep is very small. You can increase your timestep by for example using mass scaling.
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Old   November 27, 2017, 18:10
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Another possibility is using a more coarse mesh to get preliminary results. Once that works start refining the mesh. It is difficult to advise on this without knowing your mesh size or your geometry though. Mesh convergence needs to be established starting from the coarser mesh not the other way around.

Could also check whether your employer or university provides you with access to a supercomputer.
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Old   November 27, 2017, 22:28
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Quote:
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Go through Explicit tutorial course from the Customer portal.

Your timestep is very small. You can increase your timestep by for example using mass scaling.
I donnot know how to increase the time step.could you tell me more details about the mass scaling.I am very appreciate your help.
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Old   November 27, 2017, 22:36
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Quote:
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Another possibility is using a more coarse mesh to get preliminary results. Once that works start refining the mesh. It is difficult to advise on this without knowing your mesh size or your geometry though. Mesh convergence needs to be established starting from the coarser mesh not the other way around.

Could also check whether your employer or university provides you with access to a supercomputer.
I appreciate your suggestion and cannot agree more.It's been mentioned to conduct the mesh converge.but maybe it is a little difficult to me now, is there alternative for me
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Old   November 28, 2017, 02:22
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As LK suggested I would also recommend that you go through the Explicit tutorials that you can find on the customer portal.

You can also have a look at Ansys Meshing classes to help you getting started
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Old   November 28, 2017, 02:53
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As LK suggested I would also recommend that you go through the Explicit tutorials that you can find on the customer portal.

You can also have a look at Ansys Meshing classes to help you getting started
good idea
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Old   November 28, 2017, 05:11
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As mentioned above this is an explicit dynamics issue and not a mesh generation issue, but it is caused due to the smallest mesh size, see Progressive Collapse of the structure with Ansys Autodyn.

Run your model for a few timesteps , e.g. 20 and locate the smallest timestep using a User Result, then you can proceed in fixing this. Apply mass scaling (you may be part and element scaling as well) or remake the mesh avoiding the small element size.
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Old   November 28, 2017, 08:51
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As mentioned above this is an explicit dynamics issue and not a mesh generation issue, but it is caused due to the smallest mesh size, see Progressive Collapse of the structure with Ansys Autodyn.

Run your model for a few timesteps , e.g. 20 and locate the smallest timestep using a User Result, then you can proceed in fixing this. Apply mass scaling (you may be part and element scaling as well) or remake the mesh avoiding the small element size.
Thank you .I have a lot to learn ......
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Old   November 28, 2017, 08:53
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Quote:
Originally Posted by siw View Post
As mentioned above this is an explicit dynamics issue and not a mesh generation issue, but it is caused due to the smallest mesh size, see Progressive Collapse of the structure with Ansys Autodyn.

Run your model for a few timesteps , e.g. 20 and locate the smallest timestep using a User Result, then you can proceed in fixing this. Apply mass scaling (you may be part and element scaling as well) or remake the mesh avoiding the small element size.
nice guy,
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