# Problems with generated results of 3D wing analysis

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

March 12, 2010, 10:37
Problems with generated results of 3D wing analysis
#1
New Member

Chong Shao ming
Join Date: Mar 2010
Posts: 1
Rep Power: 0
Hi all,

I am using Fluent to analyse a typical 3D wing problem under low Re. However, the CL which was obtained is way too high in region of 3.7 for AoA of 4!

(selected results from force report)
Force vector: (0.06976 0.997564 0)
pressure total pressure total
force force coefficient coefficient
n n
-------------- --------------
2.2806709 2.2830547 3.7235443 3.7274363
-------------- -------------- -------------- --------------
2.2806709 2.2830547 3.7235443 3.7274363

Could anyone help verify if the parameters used are suitable and correct?

Fluent
(grid checks and scaling have been carried out correctly)
Solver: Pressure-based
Materials: constant density and viscosity
Viscous Model: Spalart-Allmaras (at default values)
Operating Conditions: Op pressure = 101325 Pa
Boundary Conditions: (kindly refer to attached file)
Inlet-velocity inlet
Outlet-pressure outlet

Kindly point out any possible loopholes which i might have in the meshing as well. (FYI airfoil used is GEMINI, c=0.171m, b=1.2)

Attached Images
 Gambit mesh.jpg (100.6 KB, 31 views)

 April 11, 2019, 00:56 #2 New Member   veerappan Join Date: Apr 2019 Posts: 15 Rep Power: 7 that first force vector is x component ? x=sin alpha?

 April 11, 2019, 01:20 3d wing #3 New Member   veerappan Join Date: Apr 2019 Posts: 15 Rep Power: 7 dear seniors actually i am simulating naca4412 3d airfoil wing for downloaded conference paper , in that paper i got results , but my solution is very low in the two order deviated from his values for example . paper result is at 0 AOA , cl=0.0018, cd =-0.05 but my result is cl=0.0016, cd =0.00016 similarly at 5 AOA , PAPER RESULT IS CL=0.2 , CD = 0.1 but my result again cl= 0.0023 , cd = 0.0003 what any thing wrong in inlet parameters what i gave , or in scaling factor , waiting for your response

 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 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 OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Ed FLUENT 5 April 13, 2019 13:07 Zweeper FLUENT 10 March 11, 2010 12:20 Lee Siemens 4 May 26, 2006 03:39 Ralf Schmidt FLUENT 3 February 1, 2006 01:40 Mark FLUENT 0 August 18, 2004 20:24

All times are GMT -4. The time now is 04:03.

 Contact Us - CFD Online - Privacy Statement - Top