Hey guys; I have been playing with this problem for a couple of days now. And I think now it's about time to get some help. ðŸ™‚

I have a 3D space (i.e. a room) with different dimensions as the width (W), depth (D) and height (H) of the room (Please refer to the attached image, named "geometry"). There is a heat source within the geometry somewhere near the right-back-floor intersection (the location of the heat source is NOT the focus of my question). I am solving the 3D heat diffusion equation to calculate the variation of the temperature within the room, due to the heat source, as the time progresses.

Number of discretization along W, D and H directions are NW, ND and NH, respectively. Therefore, I go ahead and create a 3D matrix for the temperature field with the dimension of Tn=(NH,NW,ND). Note that the first (NH), second (NW) and third (ND) arrays of this matrix are representing height (rows), width (column) and depth (page) of the room (considering the fact that our 3D matrix is starting at point O in the schematic, as per MATLAB convention for the 3D matrix).

I solve the equation using finite difference method (using some initial and boundary conditions) and the result of the temperature field is according to my expectation (based on the inspection of the temperature matrix, Tn). However, I am having difficulty plotting/visualizing the results. Can you help me plot the temperature field in a coordinate system with its origin at point M (refer to the attached image), its x axis lying in W direction, its y in D direction and its z in H direction??

You may recommend meshgrid. But I already tried that with no success. So, let's say I define the x and y and z as three vectors with dimension (1*NW), (1*ND) and (1*NH), respectively. Using [X,Y,Z]=meshgrid(x,y,z) outputs three 3D matrices X, Y and Z with dimensions that is not the same as the Tn. So, I am really stuck.

(My .m code is attached to this question for your reference)

Thanks in advace

## Best Answer