August 15, 2018 at 2:08 amaCVPSubscriber
Hi all - I was able to successfully mesh a heart from a CT scan using the "shrink wrap > convert to solid" method in SpaceClaim. However, whenever I add inflation, the mesh quality vastly reduces (on occasion, I will get a "stair-stepping" error). I've included pictures for comparison.
I've played around with the inflation settings (including changing the gap factor) per the user manual + tutorials, but I can't seem to improve the mesh quality.
What can I do to improve the mesh quality after adding inflation?
August 16, 2018 at 2:18 amKarthik RAdministrator
Could you please elaborate the nature of your analysis? Are you solving laminar or turbulent flow in this geometry?
What are your settings for the inflation layers and what is the maximum skewness you are getting?
I am attaching a playlist of videos here which take a deep dive into some inflation techniques on Ansys WorkBench meshing.
I hope this helps.
August 17, 2018 at 6:04 pmaCVPSubscriber
Hi - thank you for your response!
My major problem is how do you know when you have enough inflation layers? I am modeling blood flow within a heart.
A Fluent tutorial for Cornell said that your layer thickness should be 1/10th of the diameter of your inflow - however, they did not give any explanation as to why. Is this standard?
August 31, 2018 at 10:20 amKeyur KanadeAnsys Employee
For improving mesh after prism generation, you can use Fluent Meshing.
In WB Meshing please export .msh file from File --> Export
Start Fluent in mehsing mode. Read .msh file. Go to Mesh --> Auto Node Move.
Select all boundary zones and click apply.
On prism layer thickness: it depends on what y+ you are targeting, what velocities you are using etc.
In general 5 layers of prism layers should be enough for regular flows. Please try to reach aspect ratio of 5-10 for first prism layer.
August 31, 2018 at 12:40 pmRobAnsys Employee
The other thing to check is where the poor cells are. With scan derived geometry you can get spikes and crevices which persist through the skin process. It may be you need to refine the surface mesh in this area.
- 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.
- ANSYS Workbench Measuring within Design
- how to improve the inflation quality at sharp corners?
- check element type
- The mesh file exporter could not resolve cyclic dependencies in overlapping contact regions error
- How to resolve Mesh Failure
- Meshing Error
- Error in meshing
- Conformal vs Non-Conformal Mesh
- execution error inside the mesher. The process suffered an unhandled exception or ran out of memory
- inflation created stairstep mesh at some location
© 2023 Copyright ANSYS, Inc. All rights reserved.