February 2, 2022 at 8:17 pmskdubeySubscriber
I am trying to understand the "Pressure Inlet" condition on my convergence solution: I have Buyoncy Driven Flow problem:
I have fluid which is at the Static Pressure (static):101325Pa, which I input into (BC) using the Supersonic/Initial Gauge Pressure (Pa): 101325. and outlet pressure is 95000 Pa
I am not sure what to put in the Gauge Total Pressure: manual suggested it should be stagnant pressure= static pressure + dynamic pressure. but for the dynamic pressure, I should have the mean velocity of the fluid. In my application, I do not have any information about the mean velocity. Imp: Do I need to assume mean velocity in the dynamic pressure?, for example, if we have water, Density: 1000kg/m3 and Velocity: 5m/s (assume) gives me Dynamic Pressure of 12500 Pa then I get the Stagnant Press=101325+12500=113825Pa? I get the following graph for the residual? Is this correct?
A. Pressure Inlet Boundary Condition with 113825Pa.February 3, 2022 at 2:16 pmKarthik RAdministratorHello The total pressure is how you have defined. The Supersonic/Initial Gauge Pressure must be specified if the inlet flow is supersonic or if you plan to initialize the solution based on the pressure inlet boundary conditions. I would specify the total gauge pressure as a known quantity. One point to note - please make sure that you are capturing the gravitational head of the fluid correctly when you are specifying these inlet and outlet pressures.
7.4.3. Pressure Inlet Boundary Conditions (ansys.com)
Yes, the convergence for these two cases should be different and hence the different residuals. I would read more into the solution than the residuals, TBH.
Viewing 1 reply thread
Ansys Innovation Space
- 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.Trending discussions
- 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
Top Rated Tags
© 2023 Copyright ANSYS, Inc. All rights reserved.Ansys does not support the usage of unauthorized Ansys software. Please visit www.ansys.com to obtain an official distribution.