# 1D Euler Boundary Conditions using Riemann Variables??

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

 December 6, 2010, 15:33 1D Euler Boundary Conditions using Riemann Variables?? #1 New Member   Ozan Join Date: Dec 2010 Posts: 1 Rep Power: 0 Hello all, I am at the moment writing a code for a uni project using a second order Lax-Wendroff scheme to model unsteady flow. I am trying to implement boundary conditions using characteristics but am struggling....the method described by Benson for a 'closed' boundary does not produce reflections but results in big oscillations in my program: 1) Do I not need to set the temperature at the boundary to be a constant? 2) Will the homoentropic method at the boundary suffice? I would really appreciate any help Thanks, Ozzy

December 11, 2010, 17:44
#2
New Member

Alexey
Join Date: May 2009
Location: St.Petersburg, Russia
Posts: 23
Rep Power: 10
Quote:
 Originally Posted by Ozzy : 1) Do I not need to set the temperature at the boundary to be a constant?
It depends on flow type at the boundary.

if it's subsonic INflow (M<1) then 2 constant values should be specified, usually total Entalpy and entropy

and 1 parameter should be determined by closest cell inside the domain, ususlly velocity u.

if bounday is subsonic OUTflow then 1 constant parameter
is specified - ambient pressure and 2 others are dtermined by closest cell inside the domain.

 Tags 1d euler, boundary conditions, riemann

 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 Pascal_doran OpenFOAM Programming & Development 16 August 25, 2015 05:35 palofpinaki CFX 7 January 5, 2015 06:51 mactech001 CFX 6 November 15, 2009 22:25 Charlie Main CFD Forum 3 March 15, 2006 17:10 Kevin Main CFD Forum 5 March 7, 2001 08:15

All times are GMT -4. The time now is 03:02.