December 20, 2019 at 4:09 pmkfouladiSubscriber
I like to put a short flexible tube (initially in straight horizontal position) in to a wavy motion. I have been told the best way to do this is to use DEFINE_GRID_MOTION UDF and dynamic mesh. I have seen examples of such UDF but I am having a hard time to get started. I can use some help or a tutorial or a video. Any suggestions would be great. Thanks.
December 20, 2019 at 4:49 pmRobAnsys Employee
There may be something on the Customer Portal (you should have access), there may also be videos with the 2019Rx online help. Otherwise it's the manual, and potentially YouTube.
December 20, 2019 at 4:59 pmKonstantinAnsys Employee
I'd like to add that Fluent documentation has a DEFINE_GRID_MOTION example which you can use as a template for your own implementation. Please Refer to Sec. 2.6.4. DEFINE_GRID_MOTION of Fluent's Customization manual - Creating and Using User Defined Functions.
December 20, 2019 at 9:34 pmkfouladiSubscriber
That's the problem. I can't find anything on the portal or internet to walk me through one. All I find is a few UDF examples.
December 20, 2019 at 9:36 pmkfouladiSubscriber
I could not find the Fluent's Customization manual - Creating and Using User Defined Functions either in the portal or outside. Do you have a link? I have a copy of Fluent 6.1 UDF manual.
December 23, 2019 at 11:59 amRobAnsys Employee
If you click on "Help" in Fluent it'll take you to the manuals in R19 & 2019R versions: from there you can navigate to the Customisation Manual.
December 23, 2019 at 4:37 pmkfouladiSubscriber
Thanks. I just went there and unfortunately there is nothing new there. It is the same thing that was in Fluent 6.1 manual. I have several questions regarding the UDF example and I can't find anybody to ask specifically. For example,
why is there "-5.0" in the sign equation sign = -5.0 * sin (26.178 * time); ?
why is the origin at origin, =, 0.0, 0.0, 0.152
I have a few more questions.
December 24, 2019 at 11:04 amRobAnsys Employee
We can't be too specific on here given the rules we have to work to.
The -5.0 will be related to motion/speed or the like. Origin will be dependent on the model.
December 24, 2019 at 10:08 pmkfouladiSubscriber
I think I figured it out the mystery behind -5.0. In the example given, there is -10.4 in the "Wx equation". In the UDF, -10.4 is replaced by -5.0 in the "sign equation" and 1/(square root (0.230)) in "omega equation". I am not sure why it has been split as such.
- 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.