TAGGED: ansys-mechanical, contacts, fluent
February 18, 2022 at 1:02 pmcanderousSubscriber
I'm modelling a section of an electric vehicle lithium ion battery pack with a serpentine liquid cooling loop, for the geometry I imported a solidworks assembly where the cells and the loop are separate parts. The model appears to be able to mesh, until I get error messages regarding overlapping contact regions.
I really don't understand what I'm supposed to do to get around this and fix it, I've tried many things such as using the share topology function in design modeler, converting the assembly into a solidworks part file, making the geometry a single part in design modeler, importing as .step and .igs, etc.
Any help is appreciated, thanksFebruary 18, 2022 at 1:42 pmRobAnsys EmployeeI'm not sure where all the fluid is, but I suspect the contact regions are Meshing being overly sensitive with the tolerances. Can you confirm the surfaces between the annular volumes have a finite area? If you delete all of the contact regions you should be OK. But, you do need to check you have all the correct volumes in the domain.
February 18, 2022 at 2:05 pmcanderousSubscriberThanks for responding.
The fluid domain is inside the wavy tube in between the cells. I've tried fiddling with the tolerances in the contacts menu to no avail. I've thought about just deleting all the contact regions but would this still make the simulation run properly? Is there anything I have to do to compensate for these missing contact regions? Also sorry but which surfaces/volumes are you actually referring to and how do I know these are correct?
February 18, 2022 at 5:36 pmRobAnsys EmployeeContact regions are to allow the solvers to pass information between disconnected surfaces as long as they're fairly close together (based on solver tolerances). If you only intend and expect to pass heat where the faces actually touch they're not necessary. However, because parts of those faces are in very close proximity the meshing tool thinks they should be in contact: it's a tolerance rule and whilst useful can be a little overzealous in it's choices.
February 19, 2022 at 1:30 pmcanderousSubscriberThank you so much for explaining this, I think it goes to show that I had a fundamental misunderstanding of what contact regions were used for.
February 21, 2022 at 12:28 pmRobAnsys EmployeeIt's from the Mechanical tools: they use contact to describe how solids interact. So a contact might be fixed ie glue or allow two bodies to slide over each other, or separate etc. In Fluent we use an interface where we don't want the mesh to match between zones but do want to pass heat and mass. They're less commonly used in CFD simple because a conformal mesh is generally better.
Viewing 5 reply threads
Ansys Innovation Space
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
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
- Suppress Fluent to open with GUI while performing in journal file
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Getting graph and tabular data from result in workbench mechanical
- The solver failed with a non-zero exit code of : 2
- Difference between K-epsilon and K-omega Turbulence Model
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error in cfd post
Top Rated Tags
© 2023 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.