|
[Sponsors] |
March 3, 2022, 04:36 |
6DOF Propeller Analysis
|
#1 |
New Member
Join Date: Jun 2021
Posts: 13
Rep Power: 4 |
Hello everyone, I'm currently trying to theory craft how to do a 6DOF analysis of a propeller attached to a body.
Does anybody has any kind of experience on this, for example using Sliding Mesh inside a overset or using some sort of nested oversets? any source of resources which I can read/access to would be highly appreciated. I did already check users guide - theory guide and some forums thanks |
|
March 3, 2022, 05:40 |
|
#2 | |
Member
Void_CFD-user
Join Date: Feb 2022
Posts: 67
Rep Power: 4 |
Quote:
6DOF is usually for fine mesh that sticks to a body that translating in coarse mesh space, liker free fall. Anyways, you know your project the best. There is some example on using multiple overset mesh online, just create a bunch on gradually refined mesh and append them all. https://www.youtube.com/watch?v=jukm6w3vMXc If you can explain the physics of your problem and how overset or 6DOF fits then I can help you more here. |
||
March 3, 2022, 05:56 |
|
#3 | |
New Member
Join Date: Jun 2021
Posts: 13
Rep Power: 4 |
Quote:
The reason I want 6DOF is to observe the movement of my object that is tied to an impeller. For this purpose, I'm currently trying a sliding mesh inside an overset mesh, which is again inside a much coarser mesh as you suggested. The properties of propeller is 1 DOF Rotation with respect to the body, and 6 DOF Rotation with respect to the global domain. Also, I did a pretty heavy research on YouTube as well regarding this topic, and unfortunately couldn't found no similar case Last edited by anan12345; March 3, 2022 at 05:57. Reason: typo |
||
March 3, 2022, 06:07 |
|
#4 | |
Member
Void_CFD-user
Join Date: Feb 2022
Posts: 67
Rep Power: 4 |
Quote:
|
||
March 4, 2022, 00:52 |
|
#5 |
New Member
Join Date: Jun 2021
Posts: 13
Rep Power: 4 |
So, I currently solved some of my problems without using UDF's. Here is my updates for anyone interested.
- Currently my propeller has 1 DOF wrt the body's geometry, and the body has 6DOF itself. This is defined by the GUI of Fluent, 22R1. - While testing with some force on the body and radial velocity on the propeller, I can see both movements are what I wanted. This is done by Preview Mesh Motion. - Body of my object has an Overset Mesh, with a Sliding mesh domain inside for the propeller. - When I run the simulation, I see no movement for the body. I'm guessing this is because the forces on the propeller is not transmitted to the body itself. Trying on some fixes for this like a scheme execute command or another UDF. |
|
August 17, 2022, 04:09 |
|
#6 |
New Member
aykay
Join Date: Dec 2021
Posts: 5
Rep Power: 4 |
Hi Anan,
I am working on a problem similar to yours. I have a rotating fan attached to a static body. The fan is enclosed in 1D rotating overset zone. To make 3D overset mesh, I introduced a small gap b/w fan and the body. The overset boundary seems reasonable - with no orphan cells. My problem is exactly like yours, the fan is not giving any roll angle. Neither does it record any rolling moment. Did you happen to solve your problem? What worked? |
|
August 17, 2022, 05:29 |
|
#7 | |
New Member
Join Date: Jun 2021
Posts: 13
Rep Power: 4 |
Quote:
The problem I was facing has a dynamic body with 6DOF characteristics which has a propeller attached to it. I managed to solve it by attaching a MRF zone which contains the propeller, inside the overset domain, which has 6DOF movement. After this, giving the MRF zone 0 angular and axial movement by setting it's dynamic mesh properties all to zero, with respect to the overset domain. |
||
August 17, 2022, 05:56 |
|
#8 |
New Member
aykay
Join Date: Dec 2021
Posts: 5
Rep Power: 4 |
Thank you for the response. One more question please:
In one of your comments, you mentioned "When I run the simulation, I see no movement for the body. I'm guessing this is because the forces on the propeller is not transmitted to the body itself. Trying on some fixes for this like a scheme execute command or another UDF." Did you find a fix and eventually saw movement of the body with 6DOF? |
|
October 5, 2023, 05:13 |
|
#9 |
New Member
Rajat
Join Date: Oct 2023
Posts: 1
Rep Power: 0 |
Hi Anan I would like to connect with you on this I am also facing same issue.
What do you mean by MRF zone inside overset domain. Are you creating two cell zones for propeller ? |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Underwater Propeller CFD analysis with Ansys CFX | Alaeddine | CFX | 7 | March 30, 2018 01:37 |
Turning the Tutorial propeller case into a flow driven case with 6Dof | efirvida | OpenFOAM | 0 | March 7, 2017 09:45 |
ship propeller thrust performance analysis | burak samsul | FloEFD, FloWorks & FloTHERM | 6 | December 4, 2013 06:18 |
Flow Analysis Around Aircraft with Propeller Effect | theengineer | Mesh Generation & Pre-Processing | 0 | August 13, 2013 05:37 |
Analysis of propeller with nozzle | Ammu | FLUENT | 0 | July 1, 2005 08:00 |