Question about PISO

kar · February 16, 2008, 14:10

Hi,
I'm trying to understand p-U coupling, but have no idea how to obtain initial PISO equation a_p U_p = H(U) - grad(p) from momentum PDE. Please, could you explain?

K.

alberto · February 17, 2008, 00:23

Here you find some note and reference:

http://openfoamwiki.net/index.php/Th...hm_in_OpenFOAM

http://openfoamwiki.net/index.php/Th...hm_in_OpenFOAM

Regards,
Alberto

kar · February 17, 2008, 04:09

I was looking there already and that doesn't answers my question. I'd like to start with theoretical explanation rather than looking through code files!

Thanks to Harvoje for making his thesis publicly available and full of useful information, but I'm missing explanation how equation 3.136 is introduced.

stephan · February 17, 2008, 05:09

hi,

this paper helped me a lot, so maybe it's nice for you too?!:
Issa, "Solution of the implitly Discretised fluid flow equation by operator splittiing" in J. of Comp. Phys. No. 62, 1985, S. 40-65
there is another one about bouyant flow which might be interesting too..
br
stephan

kar · February 17, 2008, 05:41

It probably would be nice, if I could access it online... Since most of these articles are not for free, most likely I can't.
But thank you anyway!

jaswi · February 17, 2008, 05:53

Hi Karlis

Send me an email. I have this paper.

Kind Regards
Jaswi

lgriffiths · March 10, 2008, 09:29

another good paper on PISO is:

"The computation of compressible and incompressible recirculating flows by a non-interactive implicit scheme"

Journal of computational physics
1986
vol.62 pp66-82

it appears directly after the previously mentioned paper by ISSA, covers the application of piso.

February 16, 2008, 14:10	Hi, I'm trying to understand	#1
kar Senior Member Kārlis Repsons Join Date: Mar 2009 Location: Latvia Posts: 111 Rep Power: 17	Hi, I'm trying to understand p-U coupling, but have no idea how to obtain initial PISO equation a_p U_p = H(U) - grad(p) from momentum PDE. Please, could you explain? K.

February 17, 2008, 00:23	Here you find some note and re	#2
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	Here you find some note and reference: http://openfoamwiki.net/index.php/Th...hm_in_OpenFOAM http://openfoamwiki.net/index.php/Th...hm_in_OpenFOAM Regards, Alberto __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

February 17, 2008, 04:09	I was looking there already an	#3
kar Senior Member Kārlis Repsons Join Date: Mar 2009 Location: Latvia Posts: 111 Rep Power: 17	I was looking there already and that doesn't answers my question. I'd like to start with theoretical explanation rather than looking through code files! Thanks to Harvoje for making his thesis publicly available and full of useful information, but I'm missing explanation how equation 3.136 is introduced.

February 17, 2008, 05:09	hi, this paper helped me a	#4
stephan Senior Member Stephan Gerber Join Date: Mar 2009 Location: Germany Posts: 118 Rep Power: 17	hi, this paper helped me a lot, so maybe it's nice for you too?!: Issa, "Solution of the implitly Discretised fluid flow equation by operator splittiing" in J. of Comp. Phys. No. 62, 1985, S. 40-65 there is another one about bouyant flow which might be interesting too.. br stephan

February 17, 2008, 05:41	It probably would be nice, if	#5
kar Senior Member Kārlis Repsons Join Date: Mar 2009 Location: Latvia Posts: 111 Rep Power: 17	It probably would be nice, if I could access it online... Since most of these articles are not for free, most likely I can't. But thank you anyway!

February 17, 2008, 05:53	Hi Karlis Send me an email.	#6
jaswi Senior Member Join Date: Mar 2009 Posts: 248 Rep Power: 18	Hi Karlis Send me an email. I have this paper. Kind Regards Jaswi

March 10, 2008, 09:29	another good paper on PISO is:	#7
lgriffiths New Member Laurence Griffiths Join Date: Mar 2009 Location: Bristol, UK Posts: 18 Rep Power: 17	another good paper on PISO is: "The computation of compressible and incompressible recirculating flows by a non-interactive implicit scheme" Journal of computational physics 1986 vol.62 pp66-82 it appears directly after the previously mentioned paper by ISSA, covers the application of piso.

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