Fan BC - Piecewise-linear profile

fedefreefly · November 21, 2015, 10:26

Hello everybody, I´m Federico, first time I´m writing here

I´m dealing with a fan boundary condition, and in particular i need to create a piecewise linear profile for the pressure jump, as the one in the picture below.
Now my question is how do I have to set the points? Should i select 2 points, for example - from the image - the first point 0,3 m/s - 500 Pa and the second 0,5 m/s - 100 Pa; or should I select more points (for example specifying the origin etc.) ?
Thanks!

PS: I´m using a VOF model with steady pseudo-transient simulation.

12270546_10208035985278392_1675607784_n.jpg

bhargavbharathan · November 23, 2015, 16:00

Hi,

I would suggest plotting the same graph on matlab and do curve fitting. Any other curve fitting software should work equally well. After curve fitting you can use the polynomial you get as piecewise.

-BB

November 21, 2015, 10:26	Fan BC - Piecewise-linear profile	#1
fedefreefly New Member Federico Join Date: Nov 2015 Location: Rome Posts: 2 Rep Power: 0	Hello everybody, I´m Federico, first time I´m writing here I´m dealing with a fan boundary condition, and in particular i need to create a piecewise linear profile for the pressure jump, as the one in the picture below. Now my question is how do I have to set the points? Should i select 2 points, for example - from the image - the first point 0,3 m/s - 500 Pa and the second 0,5 m/s - 100 Pa; or should I select more points (for example specifying the origin etc.) ? Thanks! PS: I´m using a VOF model with steady pseudo-transient simulation. 12270546_10208035985278392_1675607784_n.jpg

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November 23, 2015, 16:00		#2
bhargavbharathan Member Bhargav Bharathan Join Date: Jun 2015 Location: Montreal, Canada Posts: 71 Rep Power: 10	Hi, I would suggest plotting the same graph on matlab and do curve fitting. Any other curve fitting software should work equally well. After curve fitting you can use the polynomial you get as piecewise. -BB