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Jul
28
asked Potential flow over cylinder with FEM: Pressure field is flipped
Jul
18
awarded  Popular Question
Jul
10
comment Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
Yes, I just realized that. Now I am on the hunt for a generalized Hookes law that describes a cantilever with transverse load (original mma example). Would you mind putting the final statement in your answer "The results are unchanged from those produced by the code in the question but differ from that of the test case, because the differential equations are different." in bold? This is vital. I was under the impression that the plane stress operator in full would still solve the linear deflection situation while it solves only the transverse load condition.
Jul
10
accepted Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
Jul
10
comment Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
I suppose I am unable to understand what the x and y directions are. Is x along the thickness of this bar element and y along its span? If so, should the load be an +xload? (of course the difference between - and + loads would be the sign of the deflection alone)
Jul
9
comment How to solve heat equation with Robin type conditions with NDSolve?
Are you sure of your boundary conditions? This example has Robin boundary conditions. (it is a link to a pdf file)
Jul
9
comment Displaying a matrix with integral entries
What I have noticed is m.n would "work" to produce a meaningful result for matrices m and n but m//MatrixForm . n//MatrixForm does not compute. This would seem to be not explicit in the documentation?
Jul
9
comment Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
@bbgodfrey yes. But in a purely axial load setting, there will be deflection only in axial x direction (u here)
Jul
9
revised Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
cleaning up of code
Jul
9
revised Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
deleted 529 characters in body
Jul
9
comment Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
@bbgodfrey But with inactive, the operators do execute. I still do get an interpolating function result. The real question for me is to understand why the example problem in the mma documentation uses inactive if it is of no use for this situation. I'll clean up the code like you say.
Jul
9
comment Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
@bbgodfrey I have not used the Dirichlet condition gamma although I could have. I'm not sure about the "inactive", I forget what it does. Yes a rectangular mesh works better but I want to compare rect to tri :)
Jul
9
comment Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
@bbgodfrey The transverse direction, although included should not affect the results. The object here is that the plane stress operator could be used for this example. If you look at modern FEM software, this axial problem includes transverse direction but only an axial load. The question here is how to model the axial load in terms of Neumann or other values mma understands.
Jul
8
asked Specifying NeumannValue for Axial load instead of transverse load (Plane Stress situation)
May
18
comment Choosing FEM element type and mesh refinement
@MichaelE2 Yes, I just found the QuadElement. However, am I to understand that I cannot force Mathematica to use a QuadElement on an irregular shape? It always defauls to a TriangleElement.
May
18
comment Choosing FEM element type and mesh refinement
@MichaelE2 Yes. But how can I ensure that "MeshRefinementFunction" allows me to specify regions of refinement? Also, the "MeshElementType" -> "TriangleElement": Are there other "MeshElementType" that aren't mentioned in the Help menu?
May
18
comment Choosing FEM element type and mesh refinement
@AlexeiBoulbitch I meant tri along CURVED boundaries and Quad everywhere else.
May
18
comment Choosing FEM element type and mesh refinement
@AlexeiBoulbitch yes, I forgot to mention that. Tri around the boundary and quads everywhere else. This refinement might not have physical significance but will serve only as an example.
May
18
comment Choosing FEM element type and mesh refinement
@Nasser I did that. However it pastes weird symbols. I'll try that again just to make sure. Thank you!
May
17
asked Choosing FEM element type and mesh refinement