June 28, 2021 at 3:04 pmnctrung1407Subscriber
I want to simulate a simple 2D rectangular with transient time, VOF (air and water), and laminar - viscous model.
I set up to pump from the top (inlet) to bottom (outlet).
The velocity was increased from inlet to outlet, and the pressure has the same results.
Is it incorrect? because follow Bernoulli's equation, when the velocity is increased so, the pressure is decreased.
But in my case, it is weird.
Does anyone solve this problem like me before?
Please give me some advice.
Thanks!June 28, 2021 at 3:21 pmaitor.amatriainSubscriber"when the velocity is increased so, the pressure is decreased"
This conclusion is only valid in steady flows, with constant density and negligible mass and viscous forces. I do not think that your case is well-suited to these assumptions.
In order to help you, it would be interesting to see a general picture of the problem with the boundary conditions, as well as screenshots of the mesh and contours of some variables.
June 28, 2021 at 3:57 pmJune 28, 2021 at 4:51 pmDrAmineAnsys EmployeeLooks after bad convergence with wrong setup or set of bcs. Details?
June 29, 2021 at 1:40 amnctrung1407SubscriberSure, DrAmine!
Which information do you want to see?
June 29, 2021 at 6:12 amDrAmineAnsys EmployeeModels used and velocity vectors.
June 29, 2021 at 6:13 amDrAmineAnsys Employee+ Residual Convergence
June 29, 2021 at 6:45 amJune 29, 2021 at 7:29 amDrAmineAnsys EmployeeWhat is the secondary phase boundary condition at you velocity inlet? From Velocity vector one clearly see how the jet is deviated and the presence of some "recirculation" zones which are affecting the orientation of the jet. I assume that is only a snapshot and the orientation / flow regime is changing over the time. In this kind of cases I never trust 2D runs and tend to directly use 3D and extend the geometry downwards using a sort of venturi diffusor or plenum it does depend on what you really have at the outlet.
Viewing 8 reply threads
Ansys Innovation Space
- You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from life-saving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
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
- Heat transfer coefficient
- What are the differences between CFX and Fluent?
- Floating point exception in Fluent
- The solver failed with a non-zero exit code of : 2
- Getting graph and tabular data from result in workbench mechanical
- 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
© 2022 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.