[kevin8843]

Hi all
I'm a Mechanical Engineering student from Taiwan
And my English is not so good.
So maybe I can't express what simulation i want to do so well.

My reserch is put a vibration fan at a shell space.

The size of shell space is 300*150*10(mm)
And the size of fan is 30*30*0.3(mm)
And the fan place in the center of shell space.

Seniors tell me to give the fan an expression as
"0.004[m]*(x/0.03[m])*sin(pi*Time/0.01)"
(A fan with the tip amplitude as 8mm and frequency as 50Hz)

If I run it for steady state the time of solve is very quick.
And the results of stream line look so weird.

My seniors run it for transient at that time.
And he set Total time as 0.04s
Time steps as 0.01s
And add a Trn Results what program ask him to add.
He set 1 at Output Frequency and he don't know why.
but the results of stream line is also weird.
all stream focus on fan and don't bring the air onward.
and the velocity is very slow.

I tried to set the total time for 0.04s
and time steps as 0.001s
but it will be error.


The part of mesh.
My senior teach me very simple.
We only change the setting of sizing

Use Advanced Size Funtion ON:Proximimity and Curvature
Relevance Center Fine
Smoothing High
Span Angle Center Fine
(P.S. He don't know why choose these)

Min Size 0.0003m (the height of fan)
Max Face Size 0.001m
Max Size 0.005m

And we do Face Sizing on fan Element Size 0.0003m


I ask for helo from many people but nobody can help me.
Then I found this forum so I ask for help here.
Thanks.