August 5, 2019 at 2:47 pmmattsarg55Subscriber
I am currently working on modeling flow through a butterfly valve when it is open/closed and at a few other angles. I have gotten the closed version to work and now I am trying to get the open version to work using the same model (Laminar flow, 1-inlet/1-outlet, same flow velocity, same solving methods). However, after multiple attempts I keep getting results that are inf (look at picture below titled 'contour prob'). My continuity is going off the charts so I assumed to change my mesh and make it a higher density, but to no avail. I have tried multiple meshing attempts all different so I am not sure if this is the problem anymore.
Could anyone provide insight onto what may be causing this? Like I said the closed version worked and now all I did was turn the valve to be open in SpaceClaim.
Below I will post a pic of the mesh as well, keep in mind this is just one of MANY meshes I have tried.
August 5, 2019 at 2:48 pm
August 5, 2019 at 3:25 pmRobAnsys Employee
Can you put a plane on the y-centre plane? Want to check you've got mesh in the right places. What are the boundary condition? Also, what's the mesh quality?
August 5, 2019 at 3:46 pmmattsarg55Subscriber
As far as boundary conditions go the only thing I have altered from the norm is the velocity at the inlet to be 24.384 m/s. Walls and interior are not altered, and the outlet pressure is at 0 pa so that we are operating at atmospheric pressure.
Thank you so much for the response this has been driving me nuts lol
August 5, 2019 at 3:55 pmmattsarg55Subscriber
That particulary mesh has a minimum orthogonal quality of 0.00.
a maximum skewness of 1.728177
124 skewed cells
and a cell count of 242852
August 6, 2019 at 12:39 pmRobAnsys Employee
That'll definitely not help convergence. Please review where the poor elements are and retry with a mesh that's not got flat elements in it.
August 6, 2019 at 3:22 pmmattsarg55Subscriber
How would I go about doing this though? Where are my poor elements? How would I make it so these flat elements do not appear?
August 6, 2019 at 3:57 pmRobAnsys Employee
In Fluent Meshing insert a mesh improvement operation after "Create Volume Mesh" has completed. There are also some options in the Display menu to view the mesh.
Assuming the valve touches the outer casing have a look in the geometry for where the valve & casing meet.
- You must be logged in to reply to this topic.
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.
- 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
© 2023 Copyright ANSYS, Inc. All rights reserved.