Elmer Discussion Forum

Thank you for the help. It seems to be working now.

I had no idea you could use the "velocity 1 condition = ..." in the boundary conditions section, this is what was troubling me.

regardless, I should be ok from here on in. thanks again.

If we are specifying velocity at the boundaries using the conditional BC method described above, how do we ensure there is flow into the domain, except by using the regular "boundary condition" section, which would create dirichlet conditions both upwind and downwind (this is not what is d...

Thanks for your quick response, Peter. What you said is basically what I expected. So, to summarize, I understand that the body force section should be of the form: Body Force 1 Velocity 1 = Variable Time, Coordinate 1, Coordinate 2 Real MATC "(cos(OMEGA*tx(0))-1)*tx(1)-sin(OMEGA*tx(0))*tx(2)+c...

I wish to simulate a vertical axis wind turbine (2D) which will be centered in a circular boundary. As such I have 2 conceptual questions: 1) Will rotating the boundary conditions attain the same effect as rotating the entire geometry? Correct me if I'm wrong, but don't the Navier Stokes equations c...

Thank you for your response. I see now how it works... I have one more question I hope you can answer. Let's say I would like to model a rotating cylinder in a cross flow using this method. Since I would need to use a rotating boundary condition, is there any way I could ensure just a zero pressure ...

Hello, I'm wondering whether the rotating flow test case is working properly. TEST CASE 1 solves very well, creating the desired rotating flow. However, TEST CASE 2, which I believe is intended to produce similar results, only produces a zero velocity field (or at least zero down to machine precisio...

Where might one find this test case? Is it documented anywhere?

Hi, I'm trying to do a similar simulation so I will bring back the topic of this thread. Is it possible to have a rotating surface AND have that surface experience deflections due to stress induced by fluid flow? The original post has the turbine surface being rotated in time due to a simple rotatio...

It turns out it is not so simple to get parallel processing to work from the installation provided in the ubuntu repositories (at least with with LTS 10.04 version of ubuntu)... After trying for awhile i ended up cleaning elmer up and re-installing using the guidelines found at: http://www.elmerfem....

I just came into some decent computational power... and am about to begin the process of using ELMER for a fairly complicated FSI simulation. Problem is, I need to (obviously) perform the simulation in a parallel manner. Being completely new to parallel processing, I am wondering what suggestions yo...