CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Guidance sought - drag of a sphere with bump

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   February 5, 2015, 10:51
Default Guidance sought - drag of a sphere with bump
New Member
Join Date: Aug 2011
Posts: 1
Rep Power: 0
Europa is on a distinguished road
Dear CFD experts,

I'm working on a Computer Science research project in the field of machine learning. I'm so close to the end, I can almost taste it, but I've been asked to do some extra experiments using an artificial data set with some particular properties.

I will generate 1000 high-resolution sphere & cube-meshes (STL or OBJ format), with some subtle differences (small surface ridges at random positions). I then need the drag values for each of these 1000 spheres to complete my data set.

I've been directed to use OpenFOAM, with which I have very little experience. I've spent the past few hours looking through the example folders and running some of them in order to see if I can easily acquire the drag value from the converged files, but as of yet, no luck.

My questions from anybody kind enough to give me some advice:
  1. I understand I am to use a particular solver. Can I get drag data using the simpleFoam solver? If so, how do I get a singular drag value from the data?
  2. The motorBike example in the simpleFoam appears to load an OBJ file, generate a CFD mesh, run the simulation and output the data files. What modifications to this example would be needed before I had it load one of my sphere/cube STL/OBJ's?
  3. What advice can you give?
Please forgive the naivety of some of these questions. Physics and aerospace are not fields I am knowledgeable in.

I don't necessarily need the "most appropriate" method, obviously this is a toy problem and I'm mostly interested in the machine learning side of things. That said, the data set needs to exhibit the same properties that aerodynamic functions of shape (such as drag) exhibit because the motivation behind the research is closely related to this.

Thanks in advance for taking the time to read and respond,

Europa is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Drag coefficient for a sphere Nico A. OpenFOAM Running, Solving & CFD 0 July 5, 2011 12:21
Urgent: Modeling the drag on a stationary sphere in a parabolic Pres driven pipe flow farhan CFX 4 April 9, 2009 00:36
CFX analysis of a sphere - drag too low Rob Findlay CFX 6 March 26, 2007 10:11
meshing F1 front wing Steve FLUENT 0 April 17, 2003 12:37
How calculate drag force for porous sphere Chandan Sarkar FLUENT 2 September 23, 2002 02:12

All times are GMT -4. The time now is 10:29.