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Sin wave signal Input in Laminar Flow

Posted Oct 17, 2011, 9:57 a.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD), Materials Version 4.2 2 Replies

Irfan Malik
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Hey All,

I am trying to simulate Laminar flow in a Channel where the inlet velocity is being updated by a Sin-wave function and I have some queries in this regard.

1. Does COMSOL has an option for 'offset' of fuctions ? or I just have to give it manually in my velocity inlet field of the Physics .

2. A Sin-wave should result in a reverse flow in the channel (since it occurs between +z and -z , where 'z' represents the upper and lower limits of amplitude) but unfortunately , I am unable to see the phenomenon in my simulation.

Please have a look at the attached model and give me some suggestions.

Thank you for your help in advance .

Sincerely,
Irfan Malik
2 Replies Last Post Oct 21, 2011, 4:45 a.m. EDT
Lechoslaw Krolikowski
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Posted: 1 decade ago Oct 17, 2011, 12:38 p.m. EDT
Hi,
Note the period of the function wv1 !
If you want to see the velocity and pressure pulsation then extend your simulation to, say 6s.
Regards,
Andrzej
Hi, Note the period of the function wv1 ! If you want to see the velocity and pressure pulsation then extend your simulation to, say 6s. Regards, Andrzej
Irfan Malik
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Posted: 1 decade ago Oct 21, 2011, 4:45 a.m. EDT

Hi,
Note the period of the function wv1 !
If you want to see the velocity and pressure pulsation then extend your simulation to, say 6s.
Regards,
Andrzej


Thanks a lot Andrzej :) That worked .

If I am getting it right, this is because the sin wave has a frequency of 2*pi . so pulsations were not being observed before this time
[QUOTE] Hi, Note the period of the function wv1 ! If you want to see the velocity and pressure pulsation then extend your simulation to, say 6s. Regards, Andrzej [/QUOTE] Thanks a lot Andrzej :) That worked . If I am getting it right, this is because the sin wave has a frequency of 2*pi . so pulsations were not being observed before this time

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