VOF+dambreak problem

yapalparvi · July 30, 2009, 21:43

Hi there,

I was looking at the dambreak problem which is solved an example to demonstrate the VOF method. In that example the function gamma is given to be either 1 or 0 for a water column. The watercolumn is defined in a rectangular region (0.146.. 0.292,0) and a function boxtocell is used. I would like like to know if this so called water column instead of being a rectangular cross section is a circular shape . How do I prescribe the gamma function?...... Thanks

Ramesh

sega · July 31, 2009, 02:27

Dear Ramesh.

I suggest you try to use the tool funkySetFields:
http://openfoamwiki.net/index.php/Co...funkySetFields

There is even an example how to set up a circular gamma field!

Sebastian.

yapalparvi · July 31, 2009, 10:10

Thanks a lot . I downloaded the package .tar.gz and untarred it. How do I compile it. I tried to use ./Allwmake .... it says permission denied.

sega · July 31, 2009, 10:32

I'm definitely not an expert in linux stuff, but maybe you can try to run the ./Allwmake skript as root?

feijooos · July 31, 2009, 10:40

try putting the tar file somewhere in your own account, for instance in $FOAM_USER_APPBIN or something similar. Then extract it and hit wmake. That should do the trick.

yapalparvi · July 31, 2009, 13:39

Thanks a lot . It worked. !!!!!.

Sebastian,

do you have any example problem done using funkySetFields?. if so could you please let me know. In the dam break problem the gamma field is set in setFieldsDict. How do I set the gamma function with funkySetFields?. What I mean to ask is should I have a file named "funkySetFieldsDict" where I can set the gamma function? Thanks

Ramesh

sega · July 31, 2009, 14:51

Quote:

Originally Posted by yapalparvi

Thanks a lot . It worked. !!!!!.

Sebastian,

do you have any example problem done using funkySetFields?. if so could you please let me know. In the dam break problem the gamma field is set in setFieldsDict. How do I set the gamma function with funkySetFields?. What I mean to ask is should I have a file named "funkySetFieldsDict" where I can set the gamma function? Thanks

Ramesh

Well, there is an example (which was made by me).
I have never used a dictionary as you can specify everything from the command line.

yapalparvi · July 31, 2009, 16:54

Hi Thanks . I tried to initialise the gamma field for the dambreak problem and used the same command as you do in the tutorial. It gives me an error

Wrong number of arguments, expected 0 found 2
Foam exiting

One more thing. what should I do with the setFieldsDict?.... in the dam break problem should I just delete it and initialise both the velocity and the gamma field from the command prompt?

sega · August 1, 2009, 03:12

Please don't use the two dots (. .).
These arguments are relicts from version 1.4.1 of OpenFOAM.

July 30, 2009, 21:43	VOF+dambreak problem	#1
yapalparvi Member Ramesh Yapalparvi Join Date: Jun 2009 Posts: 53 Rep Power: 16	Hi there, I was looking at the dambreak problem which is solved an example to demonstrate the VOF method. In that example the function gamma is given to be either 1 or 0 for a water column. The watercolumn is defined in a rectangular region (0.146.. 0.292,0) and a function boxtocell is used. I would like like to know if this so called water column instead of being a rectangular cross section is a circular shape . How do I prescribe the gamma function?...... Thanks Ramesh

July 31, 2009, 02:27		#2
sega Senior Member Sebastian Gatzka Join Date: Mar 2009 Location: Frankfurt, Germany Posts: 729 Rep Power: 20	Dear Ramesh. I suggest you try to use the tool funkySetFields: http://openfoamwiki.net/index.php/Co...funkySetFields There is even an example how to set up a circular gamma field! Sebastian. __________________ Schrödingers wife: "What did you do to the cat? It's half dead!"

July 31, 2009, 10:32		#4
sega Senior Member Sebastian Gatzka Join Date: Mar 2009 Location: Frankfurt, Germany Posts: 729 Rep Power: 20	I'm definitely not an expert in linux stuff, but maybe you can try to run the ./Allwmake skript as root? __________________ Schrödingers wife: "What did you do to the cat? It's half dead!"

August 1, 2009, 03:12		#9
sega Senior Member Sebastian Gatzka Join Date: Mar 2009 Location: Frankfurt, Germany Posts: 729 Rep Power: 20	Please don't use the two dots (. .). These arguments are relicts from version 1.4.1 of OpenFOAM. __________________ Schrödingers wife: "What did you do to the cat? It's half dead!"

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Two-phase VOF problem	scott copland	FLUENT	3	March 15, 2007 07:25
Free CFD solver for VOF problem	Jan	Main CFD Forum	1	October 30, 2006 10:15
Problem with VOF open channel modelling	Biswanath Mahato	FLUENT	1	September 14, 2006 04:20
A Problem with setting the time step in VOF model	Le	FLUENT	2	July 20, 2006 22:00
problem with VOF.	Marc	FLUENT	1	June 5, 2002 08:17

July 31, 2009, 10:10		#3
yapalparvi Member Ramesh Yapalparvi Join Date: Jun 2009 Posts: 53 Rep Power: 16	Thanks a lot . I downloaded the package .tar.gz and untarred it. How do I compile it. I tried to use ./Allwmake .... it says permission denied.

July 31, 2009, 10:40		#5
feijooos Member Eelco Gehring Join Date: Mar 2009 Posts: 70 Rep Power: 17	try putting the tar file somewhere in your own account, for instance in $FOAM_USER_APPBIN or something similar. Then extract it and hit wmake. That should do the trick.

July 31, 2009, 13:39		#6
yapalparvi Member Ramesh Yapalparvi Join Date: Jun 2009 Posts: 53 Rep Power: 16	Thanks a lot . It worked. !!!!!. Sebastian, do you have any example problem done using funkySetFields?. if so could you please let me know. In the dam break problem the gamma field is set in setFieldsDict. How do I set the gamma function with funkySetFields?. What I mean to ask is should I have a file named "funkySetFieldsDict" where I can set the gamma function? Thanks Ramesh

July 31, 2009, 16:54		#8
yapalparvi Member Ramesh Yapalparvi Join Date: Jun 2009 Posts: 53 Rep Power: 16	Hi Thanks . I tried to initialise the gamma field for the dambreak problem and used the same command as you do in the tutorial. It gives me an error Wrong number of arguments, expected 0 found 2 Foam exiting One more thing. what should I do with the setFieldsDict?.... in the dam break problem should I just delete it and initialise both the velocity and the gamma field from the command prompt?