October 5, 2022 at 8:08 am1155168052Subscriber
I would like to ask about the meaning of the “return PATH_ABORT” of the particles return status in the udf boundary conditions. According to the Ansys Fluent udf manual 2.5.1.DEFINE_DPM_BC, “for the return status PATH_ABORT, the particle will be stopped and considered to be aborted.” But when I define the status of the particles that reach the boundary as return path abort, I find that the particles still have velocity and can move with the airflow. May I ask the detail explanation about the udf “return Path_ABORT”?
My purpose is that when the particles reach the boundary, they stop moving and are not affected by the airflow, but still exist in the domain. I also try to use trap for the boundary condation, but "trap" cannot show the particle deposition distribution in a figure. Dose anyone have any suggestions for achieving this?
October 5, 2022 at 8:35 amDrAmineAnsys Employee
PATH_ABORT has the same effect as PATH_END and the particle is not tracked further.
I think you can use Trap BC, do sampling a long the wall to create a sample file which you might use to read the particles back for post-processing purposes. Though The TRAP BC does show the particle deposition distbriubtuon as Eulerian variable whenver you enable Acretion/Erosion rate calculation.
October 5, 2022 at 9:05 am1155168052Subscriber
DrAmine, thanks for your reply!
I still confused about the "PATH ABORT". If the aborted particles are not tracked further, why the aborted particles can be seen in the "Results/Graphics/Particle tracks" and the console. Is that meaning aborted particles still in the domain but the fluent software donot computer this particle? Why the particle defined as "path abort" still have velocity? What is the difference with path abort and path end?
Thank you again for your kindly reply.
October 5, 2022 at 9:37 amDrAmineAnsys Employee
They are not tracked further but they are not deleted. They will have the velocity assigned to them at the moment they are aborted.
October 7, 2022 at 6:29 am1155168052Subscriber
Thanks for your reply!
I would like to ask the meaning of "not track". For path abort, is that mean the trajectory of particles not be calculated according to Newton's second law?
But I found the particle can move on the boundary after reach the boundary and defined as abort. And the particle can still be tracked, seen from the console: "Advancing DPM injections ....number tracked = 1, escaped = 0, aborted = 1, trapped = 0, evaporated = 0, incomplete = 0, incomplete_parallel = 0".
October 7, 2022 at 7:52 amDrAmineAnsys Employee
Trajectory calculation will be stopped when using Abort.
I recommend to trap the particles and rely on the contours of Acretion rates to see where they deposit.
- 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.
- 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
© 2022 Copyright ANSYS, Inc. All rights reserved.