# Most Efficient Numerical Method for Solving Boundary Layer Flows

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

 August 1, 2012, 09:42 Most Efficient Numerical Method for Solving Boundary Layer Flows #1 New Member   samina Join Date: Aug 2012 Location: Pakistan Posts: 4 Rep Power: 6 hi friends, Can anyone tell me about some efficient n stable numerical schemes to solve Boundary Layer Flow Problem. thanks With profound regards. samina

August 2, 2012, 07:06
#2
Senior Member

Join Date: Aug 2011
Posts: 251
Rep Power: 8
Quote:
 Originally Posted by samina hi friends, Can anyone tell me about some efficient n stable numerical schemes to solve Boundary Layer Flow Problem. thanks With profound regards. samina
Hi Samina

which kind of boundary layer problem?
If it is 2D and over a flat plate, solving Blasius equation is straightforward.
check this :http://moon.pr.erau.edu/~gallyt/ae30...ricBlasius.pdf
If the geometry is more complex than flat plate, use any good Navier-Stokes solver.

 August 2, 2012, 12:48 #3 New Member   samina Join Date: Aug 2012 Location: Pakistan Posts: 4 Rep Power: 6 thanks leflix, you suggested a goood link. My problem is not on an easy geometry, its the BVP for the flow over an expanding stretching cylinder, (in cylindrical coordinates) 3D geometry

August 2, 2012, 13:14
#4
Senior Member

Join Date: Aug 2011
Posts: 251
Rep Power: 8
Quote:
 Originally Posted by samina My problem is not on an easy geometry, its the BVP for the flow over an expanding stretching cylinder, (in cylindrical coordinates) 3D geometry
Then the only outcome is to solve the full NS equations. Refine the grid near the wall. Hope the Reynolds number is not too high....

 August 4, 2012, 11:20 #5 New Member   samina Join Date: Aug 2012 Location: Pakistan Posts: 4 Rep Power: 6 One more issue,I have NS eq of order four, while i have only three boundary conditions.. What should i do for the missing condition. Regards

August 4, 2012, 11:43
#6
Senior Member

cfdnewbie
Join Date: Mar 2010
Posts: 557
Rep Power: 12
Quote:
 Originally Posted by samina One more issue,I have NS eq of order four, while i have only three boundary conditions.. What should i do for the missing condition. Regards
What kind of formulation of the NS equations do you have?? They are second order PDEs....

 August 4, 2012, 12:00 #7 New Member   samina Join Date: Aug 2012 Location: Pakistan Posts: 4 Rep Power: 6 Obviously, 2nd order PDEs (NS eqs for the viscous fluid). but when i convert these equations to ODE, by using similarity transform for the stretching surfaces, order of the differential equation is raised by 1, so it becomes 3rd order ODE. And when i solve the same problem for the 2nd grade fluid, i get ODE of order 4

August 4, 2012, 13:16
#8
Senior Member

cfdnewbie
Join Date: Mar 2010
Posts: 557
Rep Power: 12
Quote:
 Originally Posted by samina Obviously, 2nd order PDEs (NS eqs for the viscous fluid). but when i convert these equations to ODE, by using similarity transform for the stretching surfaces, order of the differential equation is raised by 1, so it becomes 3rd order ODE. And when i solve the same problem for the 2nd grade fluid, i get ODE of order 4

Sorry, I don't know what a 2nd grade fluid is, but if you have 3 BCs from the similarity ( I assume what you are doing is similar to the classical blasius solution, which is a 3rd order PDE), then the last one has to come from this 2nd grade fluid, whatever that might be

 Thread Tools 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 On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post primary.destination Main CFD Forum 0 May 7, 2012 02:55 ivan_cozza OpenFOAM Native Meshers: snappyHexMesh and Others 0 October 6, 2010 13:47 scottneh STAR-CCM+ 3 September 30, 2010 14:21 Tudor Miron CFX 15 April 2, 2004 06:18 Zhou Main CFD Forum 12 June 1, 2001 23:17

All times are GMT -4. The time now is 00:03.

 Contact Us - CFD Online - Top