September 10, 2020 at 8:25 amsombodyfromtheworldSubscriber
Solver takes very long time and using too many iterations. Any help would be appreciated to point where i make mistake, please see the screenshots from a setup. Two sub-assemblies with shared topology. Material is standard Structural SteelSeptember 10, 2020 at 3:53 pmSaiDAnsys EmployeeHi,nFrom the pictures attached, it looks like you have a very fine mesh which might be causing the long solve time. In addition, all your contacts are frictional which are nonlinear contacts i.e. their status can change from closed to open during the analysis. This adds to the solve time. If you want a quick initial solution (which need not be the most accurate):nChange all the contacts where you don't expect relative motion to be Bonded. Better yet, change the geometry to Share Topology between components that don't move relative to each other. This will eliminate the contacts between those components.nUse a coarse mesh initially. When you are sure the simulation runs without errors or warnings, then refine the mesh to get a more accurate solution.nnHope this helps,nSainSeptember 10, 2020 at 3:56 pmpeteroznewmanSubscriberThe solver makes as many iterations as it needs to compute equilibrium. The more nodes and elements you have, and the more contact you have, the longer it takes.nSome things you can do to make the solution take less time is to:n1) limit contact to smaller facesn2) replace the thin-wall solids with midsurfaces so that you can replace solid elements with shell elements.nnSeptember 11, 2020 at 10:14 amsombodyfromtheworldSubscriberThanks for your suggestions, I actually need to use nonlinear contacts. Is it possible to replace thin-wall solids with shell midsufaces and combine them in one assembly with other solid elements?nSeptember 11, 2020 at 3:03 pmpeteroznewmanSubscriberYes, you can have an assembly of parts where some were midsurfaced and have shell elements while others were left solid and have solid elements. You can have contact between shell elements and solid elements. Just check the box in the Contact Definition to Include Element Thickness and Mechanical will automatically put the contact elements half a wall thickness away from the shell elements at the midsurface.nViewing 4 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
- How to calculate the residual stress on a coating by Vickers indentation?
- An Unknown error occurred during solution. Check the Solver Output…..
- Saving & sharing of Working project files in .wbpz format
- Solver Pivot Warning in Beam Element Model
- Understanding Force Convergence Solution Output
- whether have the difference between using contact and target bodies
- Colors and Mesh Display
- The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
- Massive amount of memory (RAM) required for solve
- What is the difference between bonded contact region and fixed joint
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.