CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

fan performance based on blade shape

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

LinkBack Thread Tools Search this Thread Display Modes
Old   September 15, 2005, 08:25
Default fan performance based on blade shape
Posts: n/a
which CFD software can give fan performance based on blade shape?
  Reply With Quote

Old   September 16, 2005, 12:56
Default Re: fan performance based on blade shape
sudharsan natteri
Posts: n/a
Model Axial Fan Posted By: Chien-Chi Chao <Send Email> Date: Wed, 10 Jan 2001, 8:54 p.m.


I had run into some problems to analyse the flow filed of an axial fan flow. The following is my questions:

1. Is this case running in the steady-state problem or transient problem in Star-CD? 2. If we use multiple rotating reference frames to simulate the rotating flow, which method to choose as analysis model ?V explicit multiple reference frame or implicit multiple reference frame. Is it possible to use cyclic + implicit rotation to treat the flow in an axial fan (only deal with one blade row)? 3. What is turbulent model to use in axial fan case? We will need to investigate the flow in the tip clearance region. 4. As for the boundary conditions specification, what kind of boundary conditions are placed on the inlet and outlet ?V ??Inlet Boundary Condition and Outlet Boundary Condition?? or ??Pressure Boundary Condition?? in the boundary condition terminology of Star-CD? 5. What to set up the grids (one channel between blades or grid with one blade inside.), boundary locations, boundary location, analyses methods?K..


Part of the response is it really depends on what you are looking for and how much detail/cpu time you want to spend in looking at the problem. I have done plenty of axial fan studies using implicit multiple reference frames. I have run them inlet/outlet and have had very good convergence. Now if you are looking for more exact solution with distribution, or, noise, a transient solution may be better. If you are looking at thermal heat transferring through the blades, explicit may actually due better then the implicit, however, it might take longer to converge.

Typical fan models have used k-e. For the gap clearance, we have used a two layer model. I have not looked to much detail on the models where we are running different gap clearance test to know all the settings.

Hope this helps.


Messages In This Thread

Model Axial Fan - Chien-Chi Chao, Wed, 10 Jan 2001, 8:54 p.m. Re: Model Axial Fan - fred, Thu, 1 Feb 2001, 8:13 p.m.

  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
Fluent setup to determine fan performance afaik FLUENT 5 August 1, 2014 05:27
[GAMBIT] influence between angle in impeller blade and centrifugal pump performance barak182 ANSYS Meshing & Geometry 2 August 18, 2010 04:07
influence of blade geometry on fan performance Anantha Main CFD Forum 2 October 22, 2007 04:37
meshing fan blade in tunnel... fadly CFX 4 August 10, 2007 17:52
fan performance based on blade shape balaji Main CFD Forum 0 September 15, 2005 08:24

All times are GMT -4. The time now is 03:59.