2-Way FSI Highly Distorted Elm Error

- March 19, 2018 at 7:19 pm
  
  learn13
  Subscriber
  
  Trying to simulate a simple 2-way FSI: fluid flow over a beam with a low modulus (1e4 Pa) based on the oscillating plate tutorial geometry. Changing the mesh and transient properties has helped to a degree but the highly distorted element error persists. The error reports that the structural component is at fault, but the animation (attached) shows Fluent's mesh distorting. It is likely not showing the structural distortion.
  
  Any help would be appreciated. Attached are the workbench files, animation, and photo demonstrating the distortion.
  
  Mesh and time steps were reduced for file size.
- March 19, 2018 at 7:23 pm
  
  learn13
  Subscriber
  
  Currently unable to attach workbench files.
- March 20, 2018 at 9:50 pm
  
  learn13
  Subscriber
  
  I've been able to resolve the issues with the model above with better mesh definitions and better understanding of coupled time stepping.
  
  This problem seems more resilient when reducing everything to the micrometer scale length. The first iteration fails every time, even with end time as 1e-15 and stepping time 1e-17. The initial 'impact' of the pressure wave and the resultant shear force is causing distorted elements.
- May 15, 2018 at 2:46 am
  
  learn13
  Subscriber
  
  Resolved by shifting the analysis from 2D to 3D.
- December 8, 2019 at 2:56 pm
  
  SreelakshmiSandeep
  Subscriber
  
  Could you please explain what u have done to resolve the issue? I am doing a two way FSI for blood and artery and i am getting high distortion error in transient structural in the first iteration itself.

Viewing 4 reply threads

You must be logged in to reply to this topic.

Ansys Innovation Space

SimACE-23

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.

Ansys Blog

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