What is the best way to solve for friction, and in particular, heat generated due to friction (Qfric), analytically? The first presumption is that is a sliding contact (the domain can be either 2D or 3D, it doesn't really matter yet at this point). One model is to have two rectangles sliding along each other, and to be able to test for feasibility for calculating friction. The other is two cylinders (or circles) rotating in same and opposite directions, but at different angular velocities. I haven't been able to find the correlation or a way to calculate Qfric easily or readily. Based on physics, force due to friction = coeff. of friction * normal force. Ff = uN Based on thermodynamics, heat (transferred) = specific heat capacity at constant pressure (Cp) * (T_high - T_low). Q = Cp * delta(T) Any ideas or suggestions? I have access to the following tools to help me try and solve (and eventually simulate) this piece of the problem: MATLAB COMSOL Ansys CFX Ansys Mechanical Other things that might be important to note: I don't have experimental data that I am trying to simulate (yet) therefore; the materials are arbitrarily selected as steel (for both surfaces). I don't know the coefficient of friction (yet) but I can probably look that up. The surfaces do not have any type of lubricating material (i.e. dry surface on dry surface) because analytically, the introduction of any fluid (I think) makes it harder to solve.