# Are characteristics shock waves?

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

 November 15, 2000, 04:32 Are characteristics shock waves? #1 98.4F Guest   Posts: n/a When analysing flow through a supersonic nozzle we draw the characteristics which are at an angle to the streamlines. Are these characteristics nothing but shock waves? Thank you

 November 16, 2000, 05:16 Re: Are characteristics shock waves? #2 Nishikawa Guest   Posts: n/a No, they are not. A shock forms where the characteristics (from the same family) collide one another.

 November 16, 2000, 09:01 Re: Are characteristics shock waves? #3 A. Taurchini Guest   Posts: n/a Characterstics are structure along which perturbation propagate (expansion, compression or contact discontinuity). Moreover it's not said that two impinging characteristic of the same family will generate a shock ... but more realistically you have to solve the so-called Riemann problem to obtain more information. E-mail me for further explanations. Bye

 November 17, 2000, 12:46 Re: Are characteristics shock waves? #4 Rich E Guest   Posts: n/a A characteristic is a line along which an infintely weak shock, called a Mach wave, would lie if you placed a very small perturbation in the flow at the point of origin of the characteristic. You can draw two characteristics (a left running one and a right running one)eminating from any point in a (supersonic) flow field. They are useful because the govering equations describing the flow reduce from partial diffs to ordinary diffs along the characteristic. Hence by drawing a mesh of intersecting characteristics you can propagate an flow field solution from upstream to downstream. This is known as the method of characteristics

 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 gera FLUENT 12 April 21, 2014 02:16 littlelz CFX 3 August 17, 2009 09:35 GRA Main CFD Forum 2 October 19, 2006 00:24 PattiMichelle Phoenics 0 December 27, 2005 13:31 Fernando Velasco Main CFD Forum 1 April 6, 2000 14:10

All times are GMT -4. The time now is 23:55.