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1. ### ANSYS APDL help for 3D Thermal problem

Hello, Greetings! How do I get the convective surface matrix from ANSYS for 3D thermal problem. Consider a volume, where some of its surfaces are subjected to convective boundary conditions. What is the way to get those (only convective surface) matrices generated by ANSYS. Any help in...
2. ### Is there any equivalent for Ln(1+ax)?

Hello friends, I would like to know the equivalent expression/function for Ln(1+ax), where 'a' is constant. I am not interested in series expansion, I would like to know whether it can be written in terms of sum of other simple terms/functions ( It can be trigonometric, hyperbolic...
3. ### Finding Electric Potential Gradient in 3D FEM Mesh

Method suggested by uart is correct, but it suits a regular structured rectangular mesh. Because I am dealing with unstructured mesh, I would prefer to use the method proposed by AlphaZero. Thanks both for their inputs. Neverthless in strict sense ∇∅ is an elemental solution and we need...
4. ### Finding Electric Potential Gradient in 3D FEM Mesh

Hello, The value of electric potential(∅) is known at every node in a 3d finite element mesh. The relation between electric current density(i) and electric potential(∅) is i=k.∇∅, I am writing a code in c, I want to know how to find the gradient of electric potential(∇∅) at every node so...
5. ### How to find gradient of a variable in 3D mapped finite element domain

Yeah, I am not using any readymade sofware, I am writing a code in c language. Calculating gradient of a variable is a part of solving a differential equation through finite element. I am using mapped 3d hexahedral finite element. I am just enquiring an effective approach/method to calculate the...
6. ### How to find gradient of a variable in 3D mapped finite element domain

Hello, I know the value of a field variable in a 3d mapped finite element mesh. Can anyone suggest an effective method/methods to find its gradient throughout the mesh.
7. ### How to know the value at the center of trilinear hexahedral element

Hello, If we know the value of the field variables at the nodes of hexahedral element. How one finds the value at the center of the element. The hexahedral element is trilinear and solved using 2x2x2 gauss quadrature rule.