Elmer Discussion Forum

Hi Matthias, I have rerun the solver and loaded the solution into Paraview. You were right, the solution is indeed correct even on my laptop now. Previously I have been able to view the solution only in ElmerGUI Postprocessor (Postprocessor VTK…) (which might have contributed to my confusion), becau...

“We don't use any effective quantities.” Why didn’t you tell me this right after my first post few months ago? If you would have done that, then this discussion could have been limited to the clarification of a much simpler confusion. “If such would be used they should also be defined in the docume...

Peter, if you still maintain your claim that the solution is correct, then please explain to me in minute detail exactly how do you calculate the instantaneous pressure amplitude at x=0, t=0 at the input from the Elmer solver results, where the input amplitude must be 100 Pa! Please, no irrelevant B...

“Peter did not confirm your statement.” OK then, I might have misunderstood his last post. But this is easy to clarify by simply asking a pointed question. Peter, did you recognize and acknowledge that my explanations are correct, and the solution of this project given by the Elmer solver is wrong?...

Thanks Peter for confirming my conclusions that the solver gives wrong results. Now that we are sure about this fact, the next step would be to contact the people who coded the solver and ask them to kindly fix the bug. I don't know who needs to be contacted. Perhaps if you Peter know them, could yo...

Hi Organ_Mark, After a long inactivity on this thread I have lost interest in following it, which is why I reply with so much delay. But I am still very much interested in getting the solver to give the expected results. If you have found the solution to the described problem, then by all means plea...

Hi Mika, Thanks for your comment. You wrote “I don't understand how they [the Elmer results] are interpreted to be incorrect.” It is quite simple; please download the Elemer project folder C V T - P.zip file from the attachment of the first post, unzip it, and run the simulation. You will see that f...

There is a mathematical rule that says: p1*cos(om*t)+p2*sin(om*t)=p0*sin(om*t+phi)=p0*cos(pi/2-om*t-phi)= p0*cos(om*t+phi-pi/2) p0=sqrt(p1^2+p2^2) tan(phi)=p1/p2 If we want the phase shift of the sum p to be identical with the input signal of pin*cos(om*t) which is 0, then phi-pi/2 must be equal 0. ...

Thanks Peter for your input. I have nothing against leaving out density form impedance, as long as I know that it is correct to use it that way. Unfortunately I have not seen that clearly stated in the manual (or I have missed it), that is the reason for the confusion. Is it also correct to use effe...

Dear Elmer Community, First of all thanks to all who have created, published, and support this software. It has got an unbeatable advantage, which is being open source; special thanks for that. I am a beginner Elmer user and have some newbie questions, first relating to acoustics. I hope that this t...