April 24, 2023 at 9:46 pmPaul-Adrian OpreaSubscriber
Hello. I'm a beginner in using CFX and I'm having some trouble with the stator-rotor interface in CFX for an axial turbine stage. After simulating, I obtain a sudden drop in Mach number at the inlet of the rotor. I have defined the interfaces between the stator, rotor and rotor outlet with their corresponding surfaces. I also tried the stage avg. velocity constraint, I also defined the connection at Connectivity in CFX-Pre but none of these solved the issue. I used TurboGrid for stator and rotor and then in CFX I used Turbo Mode. Any ideas? This problem also happens at the rotor-outlet interface as can be seen in the picture.
May 3, 2023 at 9:21 pmrfblumenAnsys Employee
I would refer back to your velocity triangles for both the rotor inlet and rotor outlet to understand what you're seeing. Based on the rotor inlet velocity triangle, the absolute frame velocity is larger than the relative frame velocity, hence a drop in Mach number going between the stationary frame to the rotating frame.
At the rotor exit, based on the rotor outlet velocity triangle, the absolute frame velocity is smaller than the relative frame velocity, hence a drop in Mach number going between the totating frame to the stationary frame.
You can best see this by plotting velocity vectors rather than Mach number.
May 11, 2023 at 3:37 amTee Jia ZhengSubscriber
- 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.