CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Propeller Thrust and Torque Increasing

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 12, 2018, 14:08
Exclamation Propeller Thrust and Torque Increasing
  #1
New Member
 
Join Date: Jun 2018
Location: Malaysia
Posts: 16
Rep Power: 8
KindaHungry is on a distinguished road
Good Day everyone,

I am running open water test on my propeller but unfortunately my result of thrust coefficient and torque coefficient show increasing graphs. I have been working on the directions of torque and thrust but it doesn't help. Experts can give some suggestions which part to work on?

My propeller:
negative RPM with axis (1,0,0)
negative inlet velocity
zero outlet pressure
thrust direction (-1,0,0)
torque direction (1,0,0)

At first I was running using the setting exactly the same as in user guide except the way I created the interface but my result was wrong too. I got my torque and thrust coefficient as decreasing graph but negative value. I was trying to imitate or follow all the setting as in example so I have no idea which part had gone wrong.

Last edited by KindaHungry; August 12, 2018 at 14:28. Reason: extra information
KindaHungry is offline   Reply With Quote

Old   November 3, 2018, 06:59
Default
  #2
New Member
 
Join Date: Jun 2018
Location: Malaysia
Posts: 16
Rep Power: 8
KindaHungry is on a distinguished road
Hi I have found the problem to this issue.
The thing is I was using a propeller with pitch ratio P/D 0.8065 but I obtaining result data from J=0.8 to J=1.2.

For pitch ratio 0.8065, the torque coefficient, thrust coefficient will increase from low J until around approximately J=0.7 and starts to drop after that and the value can keep dropping to negative values. So what I did was I obtained date from J=0.1 to J=0.8 and the problem is solved.
Attached Images
File Type: png Capture.PNG (152.5 KB, 49 views)
KindaHungry is offline   Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculation of thrust and torque for propeller aeksberde OpenFOAM Post-Processing 2 October 28, 2019 06:23
How do I find thrust and torque for a propeller in ANSYS Fluent ? Hayatul_Maruf FLUENT 0 May 14, 2018 01:05
how to get thrust and torque from fluent acting on propeller using single enclosure Naveen Kumar Gulla FLUENT 2 April 12, 2018 08:59
calculate the thrust and torque of a propeller in open water condition. Alex song STAR-CCM+ 14 August 3, 2016 12:54
Thrust and torque of a propeller Alex H FLUENT 3 July 1, 2016 18:00


All times are GMT -4. The time now is 16:23.