Basic Fluid mechanics

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

 May 8, 2013, 03:51 Basic Fluid mechanics #1 New Member   Sayee chandrasekara mouli Join Date: Mar 2012 Posts: 21 Rep Power: 5 Hello everyone I have very bad knowldege in fluid mechanics..Explain me about Newtanion fluid.I need the derivation for the topic called "CONSTITUTIVE EQUATIONS FOR NEWTONION FLUID"(or viscous fluid)..some 6 equations like towxx=2M(mu)(du/dx) similar for yy and zz include xy,yz and zx.. explain me pls

 May 29, 2013, 05:01 #2 Senior Member   Rami Ben-Zvi Join Date: Mar 2009 Posts: 148 Rep Power: 8 Hi Sayee Chandrasekara Mouli, Newtonian fluid means there is a linear relation between the stress and the strain-rate tensors (analogous to elasticity, where the stress is proportional to the strain). This is written (in tensor notation) as Sik = -p * Iik +lambda * Emm * Iik + 2*mu * Eik where Sik is the stress, Eik is the strain-rate, p is the pressure, Iik is the identity tensor, mu is the viscosity, muv is the bulk viscosity (usually assumed 0, i.e., Stokesw assumption) and lambda=muv - 2/3* mu is similar to Lame constant in elasticity. The viscous stress, Tik, is defined as Tik = Sik + p * Iik The stain-rate is related to the velocity vector Ui through 2*Eik = Ui,k + Uk,i From these relations you can easily derive the relations you asked about. Rami

 Tags equations, newtanion fluid

 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 Attesz CFX 7 January 5, 2013 04:32 creddy_trddc CFX 1 October 30, 2011 05:30 vlnikolic Main CFD Forum 0 December 4, 2010 12:02 neo Main CFD Forum 4 September 17, 2006 06:09 Donald D. Gray Main CFD Forum 2 September 25, 1998 15:54

All times are GMT -4. The time now is 01:14.