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

Boundary conditions for c-grid airfoil

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

LinkBack Thread Tools Display Modes
Old   July 29, 2005, 00:38
Default Boundary conditions for c-grid airfoil
Posts: n/a

I'm trying to test my code on flow past an airfoil. My code is FVM cartesian structured fractional step NS solver with collocated variables. The eqns are solved in phyical space, no transformation.

I've generated a half NACA0012 c-grid using Meshpilot (since it's symmetrical). The northern side of my curved structured grids correspond to the inlet and top boundary, western to the symmetry plane, eastern to outlet and southern to foil surface and symmetry.

However, I'm not very sure how the BC can be implemented, after reading quite a few papers.

Here's my choice of BC: surface of foil: u=0,v=0,d(vel)(n)/dn=0 inlet:u=u(infinity),v=0 top: du/dn=0,v=0 outlet: du/dn=0,dv/dn=0 dp/dn=0 on all sides d(vel)(n)/dn=0 because diffusive flux into wall is 0. Pls comment on whether all these are suitable BC

The inlet and top is now a half "c" shape(due to sym), which is the northern side. So how do I implement these 2 different BC on the same side? I guess at some horizontal face, u is no longer equal to u(infinity). is that right?

hope that I've posed my qn in a clear fashion. thank you very much!

  Reply With Quote

Old   August 1, 2005, 19:38
Default Re: Boundary conditions for c-grid airfoil
Posts: n/a

your boundary conditions seems to be correct, u=u (infinity) is correct coz there is no disturbance assumed to the flow at infinity (analogous to Farfield conditions) your stagnation point BC also is fine, but you might m=want to cheack on the BC on dp/dn=0.

You can refer papers on the AIAA Journal regarding the closed loop control for stall conditions for an Airfoil, where you might get the answer, i think the author name is Volkan Kamaci. You can check on tht.

  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
External Radiation Boundary Condition for Grid Interface CFD XUE FLUENT 0 July 9, 2010 02:53
External Radiation Boundary Condition (Two sided wall), Grid Interface CFD XUE FLUENT 0 July 8, 2010 06:49
question setting up airfoil Boundary Conditions ibzyuk FLUENT 0 April 9, 2010 07:47
boundary conditions on MAC grid merrouche Main CFD Forum 0 August 24, 2003 14:49
grid manipulation and applying boundary conditions Chetan Kadakia FLUENT 3 August 22, 2000 04:51

All times are GMT -4. The time now is 01:51.