# velocity inlet with time related change of the magnitude

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 January 13, 2015, 04:42 velocity inlet with time related change of the magnitude #1 New Member   Pete Join Date: Jan 2015 Posts: 1 Rep Power: 0 Hey all, I'm a architectural engineering student and we started with a basic course in CFD during this semester. Now I would need some advice how to realize a velocity inlet with time related change of the magnitude. The aim is to simulate the start-up of a ventilator. Because if I work with constant velocity, the stationary change runs with sonic speed. But I want to simulate the real start-up condition of the ventilator. So my idea was something like a ramp increase of the velocity inlet of the ventilator. But I don't know how to realize it. BR Pete

 January 14, 2015, 07:17 #2 New Member   Join Date: Dec 2014 Posts: 4 Rep Power: 10 Hey, just use field functions as velocity inlet. ICy

February 4, 2015, 04:38
#3
New Member

sabrina bina
Join Date: Jan 2015
Location: Algeria
Posts: 10
Rep Power: 10
Quote:
 Originally Posted by ICyzzle Hey, just use field functions as velocity inlet. ICy
and if we want calculate the velocity sleep in knudsen layer ?

 Tags ramp, velocity inlet, ventilator

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