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: 15	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: 31	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: 31	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.

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August 1, 2013, 13:22		#3
zxj160 Senior Member Jian Zhong Join Date: Feb 2012 Location: Birmingham Posts: 109 Rep Power: 15	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