About storing 'solve' data and changing data

zxj160 · August 1, 2013, 11:57

Dear Foamers,

How does 'solve' store old values? What is the difference between A and B? It seems that Method 'A' does not work.

Method A: --- changing the value of 'C' here-----

solve
(
fvm::ddt(C)
+ fvm::div(phi, C)
- fvm::laplacian(kappaEff, C)
==
SourceC
);

Method B:--- changing the value of 'C' here-----

My best regards,
Jian

akidess · August 1, 2013, 12:08

All GeometricFields have a member oldTime() with a copy of the data of the previous time instance.

zxj160 · August 1, 2013, 13:22

Thanks. If I want to change 'C' by assignment after completing 'solve', then whether the GeometricFields of 'C' will be changed corresponding to the assignment.

Thanks,
Jian

akidess · August 1, 2013, 13:37

What exactly are you trying to achieve? Why do you want to change C, and how?

August 1, 2013, 11:57	About storing 'solve' data and changing data	#1
zxj160 Senior Member Jian Zhong Join Date: Feb 2012 Location: Birmingham Posts: 109 Rep Power: 14	Dear Foamers, How does 'solve' store old values? What is the difference between A and B? It seems that Method 'A' does not work. Method A: --- changing the value of 'C' here----- solve ( fvm::ddt(C) + fvm::div(phi, C) - fvm::laplacian(kappaEff, C) == SourceC ); Method B:--- changing the value of 'C' here----- My best regards, Jian

August 1, 2013, 12:08		#2
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	All GeometricFields have a member oldTime() with a copy of the data of the previous time instance. zxj160 likes this. __________________ On twitter @akidTwit Spend as much time formulating your questions as you expect people to spend on their answer.

August 1, 2013, 13:37		#4
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	What exactly are you trying to achieve? Why do you want to change C, and how? __________________ On twitter @akidTwit Spend as much time formulating your questions as you expect people to spend on their answer.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Problem in running ICEM grid in Openfoam	Tarak	OpenFOAM	6	September 9, 2011 17:51

August 1, 2013, 13:22		#3
zxj160 Senior Member Jian Zhong Join Date: Feb 2012 Location: Birmingham Posts: 109 Rep Power: 14	Thanks. If I want to change 'C' by assignment after completing 'solve', then whether the GeometricFields of 'C' will be changed corresponding to the assignment. Thanks, Jian