Operate on volScalarField as whole v access elements

adhiraj · January 14, 2012, 08:19

Hi all,
If I have a volScalarField that is formed by doing something (adding, dividing, taking square roots etc) of some other volScalarFields, should I do those operations element by element, or on the whole thing at one go?
I have the element by element version implemented, and was wondering if I could get a speedup by using the other option.

owayz · November 29, 2012, 08:25

Hi adhiraj,
Yes you can do it as a whole. For some example you can see the yPlus utility and check how yPlus is being calculated.
Can you kindly share how did you do all the operations element wise.
regards,
Awais

adhiraj · November 29, 2012, 12:35

Yes, I found that I can operate on the whole thing at once, too.
I did that and I don't know if it is more efficient or anything--the code is certainly cleaner and easier to read.
I did something like

Code:

A.internalField()[celli]=std::sqrt(B.internalField()[celli]);

or similar.

January 14, 2012, 08:19	Operate on volScalarField as whole v access elements	#1
adhiraj Senior Member Adhiraj Join Date: Sep 2010 Location: Karnataka, India Posts: 187 Rep Power: 15	Hi all, If I have a volScalarField that is formed by doing something (adding, dividing, taking square roots etc) of some other volScalarFields, should I do those operations element by element, or on the whole thing at one go? I have the element by element version implemented, and was wondering if I could get a speedup by using the other option.

November 29, 2012, 12:35		#3
adhiraj Senior Member Adhiraj Join Date: Sep 2010 Location: Karnataka, India Posts: 187 Rep Power: 15	Yes, I found that I can operate on the whole thing at once, too. I did that and I don't know if it is more efficient or anything--the code is certainly cleaner and easier to read. I did something like Code: A.internalField()[celli]=std::sqrt(B.internalField()[celli]); or similar.

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November 29, 2012, 08:25		#2
owayz Senior Member Awais Ali Join Date: Feb 2010 Location: Germany Posts: 128 Rep Power: 17	Hi adhiraj, Yes you can do it as a whole. For some example you can see the yPlus utility and check how yPlus is being calculated. Can you kindly share how did you do all the operations element wise. regards, Awais