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 Jiyeon April 6, 2009 20:15

please help me for general description of CFD

hello everyone
i happend to take a presentation of CFD introduction at my work.
there is a number of people only familiar with concent of CFD.
so i prepared for just applications and beginer stuff
but a senior resercher wants to me to clarify about
is there a limit when we use CFD,
what is a design factor of N-S eq, and how's different when open channel flow and closed channel flow in design factor wise.

i studied CFD but i never teach anyone about this so i really need help.
if anyone of you have answers i'll appriciate.

 justyou April 7, 2009 01:42

your question is too broad and ambigue to be answered...sorry...
you can find many proper materials from many other well prepared CFD books on CFD resource part of this CFD-online site
and they would be very helpful for your mission...i think...

 majidbahari April 7, 2009 06:31

The main difficulty in numerical simulations like CFD is to come to stability and convergence.Moreover, we need to experimental data to verify our numerical results; however, we can model or simulate almost all kind of fluid flows numerically, which may be more difficult experimentaly.
Quote:
 Originally Posted by Jiyeon (Post 212137) hello everyone i happend to take a presentation of CFD introduction at my work. there is a number of people only familiar with concent of CFD. so i prepared for just applications and beginer stuff but a senior resercher wants to me to clarify about is there a limit when we use CFD, what is a design factor of N-S eq, and how's different when open channel flow and closed channel flow in design factor wise. i studied CFD but i never teach anyone about this so i really need help. if anyone of you have answers i'll appriciate.

 sarium April 7, 2009 16:20

I agree with justyou..too general question.. There are many factors that you need to evaluate... to start i would look if the formulation of N.S. applies or in other words if you are still in the continuum. ( so check the Kn number for example)
Then you may want to check if you're using a Newtonian fluid.
then you may need to check if you are compress. or incompress

It is possible to simulate most of situation as long as a valid model and enough computational power are available

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