home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.math.research
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!ux1.cso.uiuc.edu!news.cso.uiuc.edu!usenet
- From: rfedkiw@math.ucla.edu (Ronald Fedkiw)
- Subject: Axisymmetric Navier Stokes Equations
- Message-ID: <1992Aug16.213111.2469@math.ucla.edu>
- Sender: Daniel Grayson <dan@math.uiuc.edu>
- X-Submissions-To: sci-math-research@uiuc.edu
- Organization: UCLA Mathematics Department
- X-Administrivia-To: sci-math-research-request@uiuc.edu
- Approved: Daniel Grayson <dan@math.uiuc.edu>
- Date: Sun, 16 Aug 1992 21:31:11 GMT
- Lines: 33
-
- I'm trying to do a calculation of the full compressible Navier Stokes
- equations for flow past an axisymmetric blunt body.
- So, I put the equations into axisymmetric form and multiply
- through by 1/Jacobian = r = distance from centerline (of axisymmetry).
- I need to do this to put the equations back into conservative form for
- my method.
- The obvious problem is that the equations are no longer valid along
- the axis of symmetry (where r = 0). The Jacobian here is infinite.
- I'm not quite sure what the implications of an infinite Jacobian are,
- but from looking at my equations it becomes obvious that they cannot
- be used to solve the flowfield at r=0.
-
- I was wondering what sorts of methods ae in common practice to solve
- for the flowfield near r=0.
- The solution is important here since this is where the flow passes
- through the strongest portion of the shockwave. (It's a normal shock
- at r=0 and the heating is high, also this is the where the stagnation
- streamline lies.)
- So, I need a good method, this might be the most important part of the flow!
-
- Any help is greatly appreciated.
-
- (I've thought about bounding the domain of the grid away from r=0,
- by 1/2 of a grid cell, but what boundry condition would I use?)
-
- Ron Fedkiw
-
- --
- Ron Fedkiw (rfedkiw@redwood.math.ucla.edu)
-
- A plan is made by someone who is sitting and thinking ...
- while others are doing.
-
-