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Forum: OpenFOAM

April 29, 2014, 10:59

Replies: 10

Aeroacoustics with coodles

Views: 2,865

Posted By klilla

Hi, yes, you need to integrate numerically...

Hi,

yes, you need to integrate numerically (I've used matlab fort he pulse) to get the solution. There is not closed solution for such problems.
Best,
Lilla

Forum: OpenFOAM

February 5, 2010, 03:26

Replies: 10

Aeroacoustics with coodles

Views: 2,865

Posted By klilla

Dear, I realised my mistake, so to complete...

Dear,

I realised my mistake, so to complete this tread:

The perturbations do not satisfy by themselves the perfect gas law, the instantaneous quantities do (like p=p0+p', etc.). So where I...

Forum: OpenFOAM

January 20, 2010, 06:55

Replies: 10

Aeroacoustics with coodles

Views: 2,865

Posted By klilla

correction

Sorry, I was a bit too fast:

p=rho0+c^2*(rho-rho0)

But the numbers are ok.

Forum: OpenFOAM

January 20, 2010, 05:44

Replies: 10

Aeroacoustics with coodles

Views: 2,865

Posted By klilla

localising the problem

I found out where the simulation is going wrong, now I just do not know exactly why.

In the initialization we have due to the perfect gas law:

rhomax=pmax/(R*T)=1.2933, which should be equal in...

Forum: OpenFOAM

January 18, 2010, 04:57

Replies: 10

Aeroacoustics with coodles

Views: 2,865

Posted By klilla

gaussian pulse

Like that:

expressions
(
benchP
{
field p;
expression "100000+0.1*340*340*exp(-log(2.)/9.*(pos().x*pos().x+pos().y*pos().y))";
}
/* benchR

Forum: OpenFOAM

January 15, 2010, 09:05

Replies: 10

Aeroacoustics with coodles

Views: 2,865

Posted By klilla

Dear Ivan, I used dimensional values. ...

Dear Ivan,

I used dimensional values.

p_0 = 10000Pa
U_0 = (0 0 0) - no background flow
T_0= 300K

and superimposed to them the pulse (maximum amplitude of 1 kg/m^3, ok this could be a bit...

Forum: OpenFOAM

January 15, 2010, 03:59

Replies: 10

Aeroacoustics with coodles

Views: 2,865

Posted By klilla

Aeroacoustics with coodles

Dear All,

I would like to open a thread dedicated for aeroacoustics, since such kind of problems is a bit different from general cfd. I saw some threads about it, but all were rather old ones, I...

Showing results 1 to 7 of 7

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