November 9, 2019 at 1:56 pmBranSubscriber
I have been using pressure-outlet for my simulation, but I often find during the calculation, that there is Reversed flow on 31 faces (13.1% area) of pressure-outlet 70.
As well as this, I am unsure if this flow reversal leads to turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 28 cells, which results in divergence.
In the dialog box for pressure-outlet, there are turbulence parameters and gauge pressures, I am wondering how to best understand what conditions to put there.
My scenario is cold air entering a closed container with the intent to cool heat generating components.
The pressure outlet is placed in a location close to the inlet, as it is modelling an air conditioner into the container, a picture is shown.
November 12, 2019 at 1:50 pmRobAnsys Employee
The aim is to avoid reverse flow. However, in this case I suspect it's always going to happen, so prevention isn't really an option. It's also a finding for your report.
The viscosity ratio doesn't tend to cause divergence (I regularly hit it and/or increase to run a model), more likely you've not resolved something due to the mesh. Post some images and (hopefully) someone can help you. I'd suggest velocity contours with & without node values as a starting point.
November 12, 2019 at 8:26 pmBranSubscriber
Thank you for your suggestion. A mesh refinement at the inlets and outlets has resolved this problem
- 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.
- 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
- Difference between K-epsilon and K-omega Turbulence Model
- The solver failed with a non-zero exit code of : 2
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error: Received signal SIGSEGV
© 2023 Copyright ANSYS, Inc. All rights reserved.