February 13, 2023 at 12:30 pmViktor PolášekSubscriber
I'm dealing with water flow in the pipe and air flow around the pipe at the same time. Whether water or air is flowing is controlled by the following condition. If temperature of monitored point (tp) at tube is below 263K, the water is flowing. If temperature of tp is above 333K water is switched off and air starts flowing. Air flows until temperature of tp is below 263K. See behavior of flowing in graph below.I'm trying solve it through expressions at water/air velocity inlet.
IF(OR(AND(tp>=263.15[K],vc=0[m/s])(AND(tp<=333.15[K],vc=0.25[m/s]))), 0.25 [m/s], 0 [m/s])
IF(OR(AND(tp>=333.15[K],vair=0[m/s])(AND(tp>=263.15[K],vair=4[m/s]))), 4 [m/s], 0 [m/s])
tp - monitored temperature of point at tube wall
vc - monitored water velocity at inlet
vair - monitored air velocity at inlet
Unfortunatelly, it doesnt work. Any idea how to solve? Thanks in advance.
Greetings amd smooth convergence.
February 14, 2023 at 3:27 pmRobAnsys Employee
Please can you expand on "doesn't work"? Ie is there an error, or the boundary isn't what you expect?
February 15, 2023 at 6:11 amViktor PolášekSubscriber
Thank you for your attention.
I mean the simulation is running, but it does not behave as I would expect. Once "tp" reaches 333.15 [K] both water and air are switched on/off so "tp" is oscillating around the peak temperature. Any idea or tip on how to describe the expression?
February 15, 2023 at 10:27 amRobAnsys Employee
Do you need the OR & AND parts? If tp then stuff, otherwise other stuff for both sides of the system. I assume you are running transient?
- 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.