October 13, 2023 at 10:11 pmEthan JohnsonSubscriber
When selecting k-omega BSL or SST models, I see that the coefficient alpha_inf is set to 0.52 -- is this a bug?
alpha_inf = 0.52 is true for the standard (Wilcox) k-omega model, and the default value for this coefficient is provided in the Fluent Theory Guide (Section 22.214.171.124 - Model Constants in Standard k-w Model).
However, when I switch the model to be BSL or SST I still see that alpha_inf is still set to 0.52, which is incorrect. Looking again at the Fluent Theory Guide, Section 126.96.36.199.2. - Product of w in Baseline (BSL) k-w Model, it provides equation 4-110 which is the correct equation for alpha_inf when using the BSL or SST model.
Just looking for a second opinion on this, maybe someone can point out what I am missing here.
October 16, 2023 at 5:22 amSRPAnsys Employee
All additional model constants like alfa_infinity have the same values as for the standard k-omega model for both BSL and SST model. 4.4.3. Shear-Stress Transport (SST) k-ω Model (ansys.com)
October 16, 2023 at 1:49 pmEthan JohnsonSubscriber
Thank you for the reply SRP!
Although there appears to be a communication breakdown between us. I am saying that alpha_infty is not a constant in the BSL and SST models.
Equation 4-110 in section 188.8.131.52.2 states the correct equation for alpha_infty: k-w BSL (Production of w) — It’s not a constant. In fact the line above the equation is very clear to point out this difference between the standard and SST/BSL formulations.
However I see the link that you sent clearly states that alpha_infty is a constant and its value is the same as the standard k-omega model.
So which is it?
- 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.
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Difference between K-epsilon and K-omega Turbulence Model
- Getting graph and tabular data from result in workbench mechanical
- The solver failed with a non-zero exit code of : 2
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- Suppress Fluent to open with GUI while performing in journal file
- error: Received signal SIGSEGV
© 2023 Copyright ANSYS, Inc. All rights reserved.