Both Target Boundaries and Target Nodes for Shell Solver and Spring 4 behaved the same way, the solution did not converge.
Kevin
Introducing springs to a point/face as a boundary condition
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Re: Introducing springs to a point/face as a boundary condition
It solved with Direct, but the displacements are 5.5E10 when they should be about 0.02.
Re: Introducing springs to a point/face as a boundary condition
Thanks for testing,
The variable of shell solver is by default specified as
Variable = Deflection[U:3 DNU:3]
Since the sif file now specifies Dirichlet BCs in terms of the component name U, one shouldn't define a different variable name in the solver section 1. That is, the line "Variable = Displacement" should now be removed from the first solver section. Thus, give also in the solver section 2 the value of the keyword Displacement Variable Name as "Displacement Variable Name = Deflection". Then the normal deflection given by the solver is about 0.01 for this mesh. I didn't check whether it changes by refining the mesh.
-- Mika
The variable of shell solver is by default specified as
Variable = Deflection[U:3 DNU:3]
Since the sif file now specifies Dirichlet BCs in terms of the component name U, one shouldn't define a different variable name in the solver section 1. That is, the line "Variable = Displacement" should now be removed from the first solver section. Thus, give also in the solver section 2 the value of the keyword Displacement Variable Name as "Displacement Variable Name = Deflection". Then the normal deflection given by the solver is about 0.01 for this mesh. I didn't check whether it changes by refining the mesh.
-- Mika
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Re: Introducing springs to a point/face as a boundary condition
Perfect, Thank You.
Kevin
Kevin
Re: Introducing springs to a point/face as a boundary condition
Wow! I am so impressed by all the discussions and the progress you have made.
I am also very excited to run Mika's elasticity_with_springs and Kevin's "shell" examples.
Mika, could you please explain how to add the new function library "SpringAssembly" to ELMER installed on a Windows OS?
Thank you both,
Mo
I am also very excited to run Mika's elasticity_with_springs and Kevin's "shell" examples.
Mika, could you please explain how to add the new function library "SpringAssembly" to ELMER installed on a Windows OS?
Thank you both,
Mo
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Re: Introducing springs to a point/face as a boundary condition
There was a windows install update on 3/26 that should include it
http://www.nic.funet.fi/pub/sci/physics ... dows-test/
http://www.nic.funet.fi/pub/sci/physics ... dows-test/
Re: Introducing springs to a point/face as a boundary condition
After a fresh update of the shell solver it should also be possible to add spring BCs by using the keyword "Target Boundaries", for examplekevinarden wrote: ↑26 Mar 2020, 12:18 Does the target boundaries also work so if there were many nodes each node would not have to be listed?
Boundary Condition 4
Target Boundaries(2) = 5 6
Spring 4 = 1.E3
End
In this connection the boundary elements can be points or one-dimensional. This should even work in nonlinear analysis if the springs however are linear. So this works without the SpringAssembly utility, which is still needed if the places of the springs are listed using "Target Nodes".
-- Mika
Re: Introducing springs to a point/face as a boundary condition
Thanks, Kevin.kevinarden wrote: ↑27 Mar 2020, 12:03 There was a windows install update on 3/26 that should include it
http://www.nic.funet.fi/pub/sci/physics ... dows-test/
Re: Introducing springs to a point/face as a boundary condition
I was wondering if I can now model this problem using the new shell solver?mika wrote: ↑27 Mar 2020, 20:00After a fresh update of the shell solver it should also be possible to add spring BCs by using the keyword "Target Boundaries", for examplekevinarden wrote: ↑26 Mar 2020, 12:18 Does the target boundaries also work so if there were many nodes each node would not have to be listed?
Boundary Condition 4
Target Boundaries(2) = 5 6
Spring 4 = 1.E3
End
In this connection the boundary elements can be points or one-dimensional. This should even work in nonlinear analysis if the springs however are linear. So this works without the SpringAssembly utility, which is still needed if the places of the springs are listed using "Target Nodes".
-- Mika
In this problem, I'd like to perform frequency analysis.
The plate is of an idealized light and stiff material. The stiffness comes from the translational and the torsional springs at point 2 which allow movement in the vertical (z) translation and pitch (y) rotation directions only (thus, the constrained degrees of freedom at point 2 are 1,2,4 and 6).
Boundary Condition 1
Target Nodes(1) = 2
Spring 3 = Real 1.0
Spring 5 = Real 1.0
End
Also, I need to establish mass properties using concentrated (point) masses at each of the grid points and a concentrated inertia at grid point 2. I was wondering if it is doable in the Shell solver?
Many thanks
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Re: Introducing springs to a point/face as a boundary condition
This does everything except for the lumped masses. There are single node elements type 101, but I do not know how to assign them a mass value.
Kevin
Kevin