Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Ansys - Explicit Dynamics Meshing/Solver help

Ansys - Explicit Dynamics Meshing/Solver help

Ansys - Explicit Dynamics Meshing/Solver help

Hi all,

I am a relatively new Ansys user and am currently analysing a space frame chassis with means of exploring the structure deformation upon impact of rigid surface.

I have created the chassis by using the 'weldment' feature on Solidworks and imported the Solidworks assembly (chassis and wall) into ANSYS Mechanical. (For the initial study I have only included a section of the Rollcage so I can understand what it is that I am doing first before I go deeper).

Why is my mesh in the form that is shown in picture 2 where a combination of mesh elements are used? Is there a better way to set up the mesh? (tubes are hollow (30mm OD,2.5 Thick)). Would it be easier to shell model the chassis?

Lastly (and I really would appreciate this a response to this) Can someone explain to me how I should set up the 'step controls' (max no. of cycles, End Time, Initial time step, Min time step and max time step.

Currently my solver times are ridiculous, For the entire Rollcage geometry in this explicity dynamics solver with everything set to 'programme controlled', the study is expected to take 100 hours.

AMD FX(tm) - 8350 Eight core processor
16Gb Ram

velocity is going to be set to 50,000mm/s

Thank you guys in advance and I apologise, In the past I have always researched what to do before seeking help but I am in a rush with this and time is starting to get the better of me.

Thank you,


RE: Ansys - Explicit Dynamics Meshing/Solver help

Your mesh doesn't look good. You should make it more regular. Shell approximation is a very good idea. Remember that in explicit analyses element size may influence computational requirement significantly. The same applies to the analyzed time period. It's usually advised to speed up events artificially whenever possible. Finally, make sure that you use parallel processing so that your computational resources are fully utilized.
You may also consider using mass scaling.

RE: Ansys - Explicit Dynamics Meshing/Solver help

Thanks for the advice, I have enabled parallel processing so that My CPU is using more available processors.

As for the meshing side of things...I will need to do some more research on the subject.

I have found that by modifying the geometry (Solidworks weldments) in "Spaceclaim" the mesh is much more uniform.

Thank you for the advice FEA Way.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


eBook - Mastering Tolerances for Machined Parts
When making CNC machined parts, mastering tolerances can be challenging. Are general tolerances good enough? When does it make sense to call out for tighter tolerances? Do you need a better understanding of fits, datums, or GD&T? Learn about these topics and more in Xometry's new e-book. Download Now
eBook – How to Choose the Correct Corrosion Testing Method
When designing a metal component, engineers have to consider how susceptible certain alloys are to corrosion in the final product’s operating environment. In a recent study by NACE (National Association of Corrosion Engineers), it was estimated that the direct and indirect costs of corrosion in the United States is approximately 6.2% of the GDP. In 2016, that cost exceeded $1 trillion dollars for the first time. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close