Elmer Discussion Forum

Hello all.

Need community help. I produced a very generic static structural model with two boundary conditions. One is a surface fixation (Displacement zero in X, y and Z) and the other a Load of of nN in the z direction normal to surface (Imagine a cube). I want to calculate the reaction at my fixation point but don't know how. I am using the Latest Elmer in Windows. It looks like I have to add some changes to the .Sip file. Anyone can guide me through the process? I can't seem to understand how to do this.

Regards,
FEMuser

https://www.nic.funet.fi/pub/sci/physic ... Manual.pdf

You can look at Chapters 58-60 in the models manual for outputting data. There is a boundary output where you can output the sum at the boundary. The problem is that I don't know what the reaction variable at the boundary is called. One of my problems with using Elmer effectively is there is no list of variables for each solver.

Hi

"Calculate Loads = Logical True" will compute the reaction forces and they will probably be called "Displacement Load" and have components 1, 2 and 3 each representing nodal load in the different directions.

-Peter

SaveScalars: -----------------------------------------
SaveScalars: Saving scalar values of various kinds
WARNING:: SaveScalars: Requested variable does not exist: displacement load 1
WARNING:: SaveScalars: Found no values to save

They do come out in paraview as Displacement Loads, and can be summed of the boundary in paraview.

Worked it out, Displacement Loads is plural. The attached sif works.

Solver 2
Exec Solver = After Timestep
Equation = SaveScalars
Procedure = "SaveData" "SaveScalars"
Filename = "forces.dat"
Variable 1 = Displacement Loads 1
Operator 1 = boundary sum
End

and you have to add save scalars to the boundary condition
Boundary Condition 1
Target Boundaries(1) = 4
Name = "fixed"
Displacement 1 = 0
Displacement 3 = 0
Displacement 2 = 0
Save Scalars = Logical True
End

Thanx Kevin! It is sometimes hard to remember all the keywords by heart. .-Peter