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Why two seperate parameters, http://windtunnelapp.com/forum/viewtopic.php?f=8&t=8	Page 1 of 1

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Author:	Rapidshot [ Sun Oct 23, 2011 3:24 am ]
Post subject:	Why two seperate parameters,
The friction and viscosity.

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Author:	Kravell [ Tue Oct 25, 2011 12:15 pm ]
Post subject:	Re: Why two seperate parameters,
Hi, Viscosity is the viscosity of the fluid, while "friction" affects the obstacles. With friction sets to minimum the fluid slips on obstacles without resistance, while with high friction you get a boundary layer at proximity of the obstacle where the fluid velocity is close to zero. You can see this clearly when you select the "speed" visualization mode. You can see in the left screenshot below a black boundary showing zero velocity at proximity of the obstacle when the friction is high.

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