TAGGED: boundary-conditions, fluent, k-omega-sst
February 8, 2023 at 9:25 pmsapkotadpakSubscriber
I am doing a simulation where I want 60% of the flow to go through one outlet1 and rest 40% to go through another outlet2. Which boundary condition should I use? I am using outflow bc with 0.6 and 0.4 flow weightage to each outlets but after looking into the streamlines flow doesnot pass through outlet1. What should I do to make it correct?
February 9, 2023 at 9:09 amSRPSubscriber
I assume you know overall flow rate. Using bernoulli you can calculate pressure at both the outlets. Now you can try velocity inlet bondary condition and pressure outlet boundary condition.
Hope this helps to solve problem.
February 14, 2023 at 7:43 pmsapkotadpakSubscriber
Could you please suggest me how to calculate the pressure at the outlets? I tried using mass flow boundary condition at inlet and both outlets but the residual didn't converge and the pressure value was -0.31 Pa. But I didn't think it will work. Is there any way I can do this?
February 15, 2023 at 5:37 amSRPSubscriber
It is not necessary to use mass flow inlets in incompressible flows because when density is constant, velocity inlet boundary conditions will fix the mass flow.
Outflow boundary condition used to model flow exits where the details of the flow velocity and pressure are not known prior to solution of the flow problem. They are appropriate where the exit flow is close to a fully developed condition, as the outflow boundary condition assumes a zero streamwise gradient for all flow variables except pressure.
For the calculation of pressure, try to apply bernoulli between two points. But I suggest try using velocity inlet and outflow boundary condition at exit.
February 15, 2023 at 5:24 pmsapkotadpakSubscriber
The outflow condition doesn't match with other experimental results. I think my geometry is small so the flow might not be fully developed. I tried using pressure outlet with targeted mass flow rate but it didn't work. I think there must be easier way to achieve targeted mass flow rate in ANSYS. This problem is quite trivial.
February 16, 2023 at 4:04 amSRPSubscriber
Can you please share screenshot of geometry?
- 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
- 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.