Search found 3428 matches

by raback
13 Jul 2019, 07:48
Forum: ElmerGUI
Topic: Cantilever Beam - Theory vs Elmer results
Replies: 18
Views: 279

Re: Cantilever Beam - Theory vs Elmer results

Hi

In the paraview (vtu file) do you see "stress zz" depicted?

Basically the volume stays constant only when Poisson ratio is 1/2. However, the change in density is not accounted for since usually the effect is minimal.

-Peter
by raback
11 Jul 2019, 23:48
Forum: ElmerGUI
Topic: Cantilever Beam - Theory vs Elmer results
Replies: 18
Views: 279

Re: Cantilever Beam - Theory vs Elmer results

Hi

How about "stress zz" ?

-Peter
by raback
09 Jul 2019, 00:50
Forum: ElmerGUI
Topic: Cantilever Beam - Theory vs Elmer results
Replies: 18
Views: 279

Re: Cantilever Beam - Theory vs Elmer results

Hi If you want to use save scalars then mass would be "operator 1 = volume" times the density. I think you can give volume "coeffcient 1 = density" to get the mass. As forces go, you could compute stresses and the take an "boundary int" over the desired stress component. Or you could calculate the r...
by raback
08 Jul 2019, 03:15
Forum: General
Topic: Using Elmer for simulation of ultrasonic tomography system
Replies: 4
Views: 155

Re: Using Elmer for simulation of ultrasonic tomography system

Hi You could study the problem on low frequency and study what happens there. However, there is no way, as far as I know, to use the low frequency model to estimate the high-frequency outcome. Maybe there is. The transient vs. harmonic choice should not have much impact on the required space resolut...
by raback
08 Jul 2019, 03:03
Forum: ElmerSolver
Topic: Electrostatic System with floating conductors
Replies: 3
Views: 96

Re: Electrostatic System with floating conductors

Hi David, Look at test case "ConstantBCTemperature". It uses linear constraints to enforce constant, yet unknown, temperature for a boundary. For electrostatics the BC would be in style, Boundary Condition 1 Name = "floating" Target Boundaries = 1 Potential Constant = Logical True End Have fun! -Peter
by raback
08 Jul 2019, 02:56
Forum: ElmerGUI
Topic: Simulation with high aspect ratio (long pipe)
Replies: 5
Views: 111

Re: Simulation with high aspect ratio (long pipe)

Hi What is your Reynolds Number? I.e. is the flow in the pipe turbulent or laminar. There is no difference whether you deal with the aspect ratio using unisotropic material parameter or huge aspect ratio. They should result to exactly the same linear systems. You should use extruded meshes such that...
by raback
08 Jul 2019, 02:42
Forum: ElmerSolver
Topic: trouble by using MovingElstatSolver
Replies: 1
Views: 57

Re: trouble by using MovingElstatSolver

Hi

I would not use that solver. Rather use StatElecSolver + RigidMeshMapper (or MeshSolver) instead, for example.

-Peter
by raback
01 Jul 2019, 04:57
Forum: General
Topic: Using Elmer for simulation of ultrasonic tomography system
Replies: 4
Views: 155

Re: Using Elmer for simulation of ultrasonic tomography system

Hi Markus It all boils down to wavenumber. Ultrasound is <2cm and hence if you want to study surroundings of cars you need at least 20 m which means at least 1000 waves. For each wave you need 10 elements. Make this 3D and you suddenly have 10^12 elements which cannot be done. So I would look at ray...
by raback
25 Jun 2019, 12:35
Forum: ElmerSolver
Topic: Problem with total energy in Electrostacis/StatElecSolve model
Replies: 2
Views: 118

Re: Problem with total energy in Electrostacis/StatElecSolve model

Hi What is the problem? Can the cross-capacitance of the pixels not explain this. If you have potential at either 0 or 100 I would guess that a mix would result to the highest energy. Note that you may introduce electrostatic energy when you set any Dirichlet condition, be it 0 or 100. Comparing jus...
by raback
25 Jun 2019, 12:23
Forum: ElmerSolver
Topic: Coupling Elmer and DDD
Replies: 3
Views: 126

Re: Coupling Elmer and DDD

Hi, you typically need to request "calculate stresses". Then you may operate with the stress as any other field variable. -Peter