Solve 3D Poisson & Laplace Equations w/ Non-Zero BCs

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In summary, the speaker is asking for help with solving the 3D Poisson and/or Laplace equation with non-zero boundary conditions. They mention that they have found help with zero boundary conditions but need a step-by-step process for solving with non-zero conditions. They also mention that their course at ASU was helpful but they are still struggling and will check out additional materials provided by the person they are speaking with.
  • #1
Zodi
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Hello every one and thank you in advance,
I'm try to solve 3D Poisson equation analytically not numerically, but the help i found has the boundary conditions equal to zero, there is anyone to have a step by step process to solve Poisson and/ or Laplace 3D equation where the boundary conditions are not zero moreover those condition are depends on x, y, and z,

looking for your help
thank you again


(∂^2 ψ (x,y,z))/(∂^2 x)+(∂^2 ψ (x,y,z))/(∂^2 y)+(∂^2 ψ (x,y,z))/(∂^2 z) =A(x,y,z)e^(ψ(x,y,z))
 
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  • #2
My course at ASU was helpful at solving similar PDE's, but I don't remember if we solved this one specifically. Here is a link to the course website, it has several notes that may prove helpful. Also, the textbook it used was okay, and took you step by step on several problems. Of course, this thread is old enough that there's probably not much use for it now, but better late than never?

http://www.public.asu.edu/~hhuang38/MAE502.html
 
  • #3
thank very much

thank very much I'm still trying to solve it i will check the materials you have provided
 

FAQ: Solve 3D Poisson & Laplace Equations w/ Non-Zero BCs

What is the difference between Poisson and Laplace equations?

The Poisson equation is a partial differential equation that describes the distribution of potential or scalar fields in a given region, while the Laplace equation is a special case of the Poisson equation where the source term is equal to zero. This means that in the Laplace equation, the potential or scalar field is only affected by the boundary conditions and not by any sources within the region.

Why is it important to solve 3D Poisson and Laplace equations with non-zero boundary conditions?

In many real-world applications, the boundary conditions are not equal to zero, meaning there are sources present within the region. By solving the 3D Poisson and Laplace equations with non-zero boundary conditions, we can accurately model and understand the behavior of potential or scalar fields in complex systems, such as electronic circuits, fluid dynamics, and heat transfer.

How are 3D Poisson and Laplace equations solved?

3D Poisson and Laplace equations can be solved using numerical methods, such as finite difference or finite element methods. These methods involve discretizing the region into smaller elements and solving the equations iteratively to obtain a numerical solution.

What are some common techniques for setting non-zero boundary conditions?

Some common techniques for setting non-zero boundary conditions include Dirichlet boundary conditions, where the potential or scalar field is specified at the boundary, and Neumann boundary conditions, where the normal derivative of the potential or scalar field is specified at the boundary. Other techniques include mixed boundary conditions, where a combination of Dirichlet and Neumann conditions are used, and Robin boundary conditions, which involve a linear combination of the potential or scalar field and its normal derivative at the boundary.

What are some challenges in solving 3D Poisson and Laplace equations with non-zero boundary conditions?

Some challenges in solving these equations include the need for a fine grid resolution to accurately capture the behavior of the potential or scalar field, the difficulty in handling complex geometries, and the potential for numerical instabilities if the equations are not discretized and solved carefully. Additionally, there may be a large number of boundary conditions to consider, making the problem computationally intensive.

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