Need help on making a structure involving some physical attributes

[Felix Felix]

Hi, 

so I am currently doing my own learning on creating a simple cubic 3D Model. Step-4 has helped me pretty well I'd say. 

My question is however is it possible to add physical attributes like a force or pressure applied to the surface of the so to say one point of coordinates or one side of a cubic model? 
Does anyone have any recommended steps? or recommended methods? 
I have read steps 22 and I find it to be way more complicated than I want it to be. 

I'd appreciate the help. 

Cheers, 
Felix 

[Wolfgang Bangerth]

On 10/25/22 12:00, Felix Felix wrote:
>
> My question is however is it possible to add physical attributes like a force
> or pressure applied to the surface of the so to say one point of coordinates
> or one side of a cubic model?
> Does anyone have any recommended steps? or recommended methods?

Felix -- boundary forces are incorporated via boundary integrals, and I
believe one of the earlier tutorials (in the range 7-10) shows how to do these
boundary integrals (=Neumann boundary conditions).

But I may also not quite understand what it is you want to do. Can you
describe in mathematical terms what your goal is?

Best
W.

--
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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[Felix Felix]

Hi, 
Thanks for the reply- 
I don't think I am qualified enough to answer in a more mathematical term however what I wanted would be something similar to the image below: 

[Wolfgang Bangerth]

Felix,

> I don't think I am qualified enough to answer in a more mathematical term
> however what I wanted would be something similar to the image below:

step-18 and step-44 (along with a couple of code gallery programs) do
something similar, so I would look there.

You will of course have realized that to answer a question, it is necessary to
formulate it. If you cannot describe in mathematical terms what the force is
and how the force enters the formulation of your problem, how are you going to
know what the weak formulation should be, and how are you going to know
whether the computed solution is correct?