I have recently started using Autodesk Simulation and am finding a lot easier to use than some alternative software. However, I would like to add low(or non)- reflecting boundary conditions to my model so that any p- or s- waves travelling through a solid element are not reflected and an infinite area is represented. I have the equation for stress in the normal direction, however it involves using the derivative of the displacement. Can anyone advise me as to how I can implement these BC?
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I don't fully understand the question. Can you please clarify your issue. What analysis type are you in? what type of boundary condition you are trying to implement, what will it represent in real life?
Sualp Ozel, PE
I am wanting to run a transient analysis. I have attached a simple model. Basically I have at least two sources of energy attached to the ground, in this case towers with a force applied to them and I want to see how this affects displacement through the ground (this can be seen by making tower 3 & 4 invisible int he attached model) and the effect of other towers nearby which do not have sources applied. I obviously can't model an infinite area of ground, so I want to apply boundary conditions to the edge of the ground which do not apply the waves to rebound (they are absorbed by the BC), but do not restrict movement of the ground. This I believe can be done using a non-reflecting boundary condition (equation in attached file). However I am not sure how to implement this.