[esp-r] Re: Time step control relaxation

[Geissler Achim]

Hi Giulio,

 

you have more than one possibility to get oscillating flow results under control:

 

(1)                 Try changing various parameters in regard to the solver control: in simulator, after "initialize", g ... simulation toggles (pwd 101), g ... mass flow parameters, and / or

(2)                 Use time step controller: in simulator, after "initialize", t ... invoke time-step controller, choice 4 (I think) was quite good (you need to have your time steps at hand, for which this should happen) and - last not least - 

(3)                 Change the relaxation parameter for the time-step controller in mfmach.f, lines 491 to 500. You need to uncomment these lines, then you can change the relaxation parameter (these work with choice 4 from above, as the source tells). 0.25 to 0.65 were useful values, I think (ESRU, please intervene if I am writing trash, here).

 

 

Mit freundlichen Grüssen / Best regards

 

Achim Geissler

________________________________

From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of giulio benincasa
Sent: Wednesday, April 18, 2007 11:57 AM
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] Time step control relaxation

 

Dear all, 

I have read that is possible change relaxation parameter 

in source code to calm oscillations results  arrange to  (in the air-flow network) similar temperature nodes and 

flow-connections that have very little pressure drops across them. 

There is anybody that know tje soutce code file where  make  modify  ??

Best regards 

Thank you in advance 

Giulio Benincasa



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