CFD Online Logo CFD Online URL
Home > Forums > FLUENT

2D Inviscid Airfoil model zero lift angle

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

LinkBack Thread Tools Display Modes
Old   December 7, 2012, 21:15
Default 2D Inviscid Airfoil model zero lift angle
New Member
Blair Hutchison
Join Date: Dec 2012
Posts: 6
Rep Power: 7
HutchMan is on a distinguished road
Hi all,

New to the forum and to CFD but my thesis is on the simulation of flow around an airfoil so thought this would be a handy resource.

I'm performing an initial inviscid flow sim on a NACA4412 before I move on to turbulent models. Basically I'm following this tutorial which I understand is widely used:

I'm trying to compare my sim data with the Abbott and Von D data and whilst I get a lift curve slope of about 2Pi as expected for a inviscid sim, I can't get the zero lift angle to agree with the Abbott data of -4 degrees. At -4 my sim gives a Cl of about 0.035.

It's as if my correct lift curve has just been shifted along the alpha axis to the left a bit so that the zero lift angles don't agree. At first, myself and my supervisor thought my coordinates were slightly off orientation wise (i.e. not at zero AoA) but I've checked them with other coordinates and confirmed that the chord line runs parallel with the x axis when imported into GAMBIT, as it should.

I've even downloaded the mesh from that Cornell tutorial and run that in Fluent only to get similar results of Cl = 0.035 at -4.

My thinking is that there must be something about the Abbott data that slightly changes the effective AoA or something along those lines.

Or perhaps this is a mesh resolution problem? Just throwing the problem out there for someone to hopefully shed light on. It'd be much appreciated.

It's irritating as I'd like to move on to turbulent models knowing my inviscid sim is as accurate as can be.
HutchMan is offline   Reply With Quote


Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
v2f model implementation for airfoil in FLUENT Sunil FLUENT 4 December 7, 2016 19:17
about Subgrid-scale model impecca OpenFOAM Running, Solving & CFD 4 December 20, 2013 11:36
How to include lift forces/wall lubrication forces in the MIXTURE multiphase model? hohomm FLUENT 0 December 17, 2009 06:45
Airfoil at stall angle cfd_newbie FLUENT 10 February 5, 2008 12:33
How is lift generated at airfoils ? Victor Serov Main CFD Forum 19 August 15, 1999 23:45

All times are GMT -4. The time now is 08:21.