How to get probability density function (PDF) in OpenFoam?

openfoam15 · July 3, 2009, 05:10

such like beta distribution function or battlement PDF. If not, Is there some mathematic function to calculate integration(detail: 1-dimension, interval 0 to 1)?

ivan_cozza · July 3, 2009, 05:19

Quote:

Originally Posted by openfoam15

such like beta distribution function or battlement PDF. If not, Is there some mathematic function to calculate integration(detail: 1-dimension, interval 0 to 1)?

Can you give more details on your question?
You need to evaluate random numbers with a certain PDF?

openfoam15 · July 3, 2009, 05:44

Thanks!
Here it is:
I need to calculate PDF such like fai(f)=(f^(v-1))*((1-f)^(w-1))/B(v,w), where B(v,w)=Integration of x from 0 to 1: {(x^(v-1))*((1-x)^(w-1))*dx}, v and w already known.

openfoam15 · July 3, 2009, 07:40

and then calculate integration of f between 0 to 1: {C_dimessionless*fai(f)df}

openfoam15 · July 3, 2009, 08:25

about calculate the fluctuation of specie's concentration.
Does someone know how to call the integration function or about this?

waiting online.

openfoam15 · July 6, 2009, 04:37

up and ask?

July 3, 2009, 05:10	How to get probability density function (PDF) in OpenFoam?	#1
openfoam15 New Member Jiayuan Jin Join Date: Mar 2009 Posts: 8 Rep Power: 17	such like beta distribution function or battlement PDF. If not, Is there some mathematic function to calculate integration(detail: 1-dimension, interval 0 to 1)?

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July 3, 2009, 05:44		#3
openfoam15 New Member Jiayuan Jin Join Date: Mar 2009 Posts: 8 Rep Power: 17	Thanks! Here it is: I need to calculate PDF such like fai(f)=(f^(v-1))((1-f)^(w-1))/B(v,w), where B(v,w)=Integration of x from 0 to 1: {(x^(v-1))((1-x)^(w-1))*dx}, v and w already known.

July 3, 2009, 07:40		#4
openfoam15 New Member Jiayuan Jin Join Date: Mar 2009 Posts: 8 Rep Power: 17	and then calculate integration of f between 0 to 1: {C_dimessionless*fai(f)df}

July 3, 2009, 08:25		#5
openfoam15 New Member Jiayuan Jin Join Date: Mar 2009 Posts: 8 Rep Power: 17	about calculate the fluctuation of specie's concentration. Does someone know how to call the integration function or about this? waiting online.

July 6, 2009, 04:37		#6
openfoam15 New Member Jiayuan Jin Join Date: Mar 2009 Posts: 8 Rep Power: 17	up and ask?