Recent content by mherna48

Hey can anyone help me prove that the derivative of sin(x)/x is zero at x=0

What's the best way to deal with a convergence error in COMSOL?

Thanks for the help. However, I don't have an equation to input; I just have two thousand points that seem to make a smooth curve. Can Matlab find the equation to the curve?

Does anyone know how to relate the cross sectional area to the equation?

Hi everyone, What's the difference between these two boundary conditions? Why are they important to know?

Thanks dude, The integration worked well. to differentiate, I understand the method, but I feel like there's a function that should do that in MATLAB. Maybe pdeval(m,x,ui,xout)??

Matlab is capable of finding the derivative of the line created by the interpolation right?

I also need to figure out how to associate this equation with the cross sectional area

The complete equation I'm working up to is: A \cdot \frac{\partial}{\partial x} \cdot \left[ \kappa(T(x)) \cdot \frac{\partial T(x)}{\partial x}\right] - m^{\cdot}_{I}C_{p}(T) \cdot \frac{\partial T}{\partial x} + \frac{\rho(T) \cdot I^{2}_{0} }{A} = 0 so, by making e_{a} = 0 d_{a} =...

For now, the cross sectional area is constant. But in the future, the geometry will not be a simple rod and will vary. I am not worried about transient analysis yet. I figure it's be best to start with the steady state and progress from there. I will also need to add convection and...

Hi, I have done the above and now would like to both integrate and find the derivative of the function created by the interpolation. How do I go about doing this?

Also, How do I make sure that the PDE mode knows to take the area of the cross section into account for the conduction part?

OK, so I have gone over the user guide and I see that they are the same. So, I'm still trying to solve the equation: A \cdot \frac{\partial}{\partial x} \cdot \left[ \kappa(T(x)) \cdot \frac{\partial T(x)}{\partial x}\right] = 0 And from what I can gather, I would just change the coefficient...

Hi everyone, I kind of figured out where to input my simple equation, but I keep getting an error due to a zero matrix. How do I find where this zero matrix is located?

That's really cool. I wonder if they stopped developing it. Maybe they don't trust people with radioactive materials.