Solution To Heat Equation by Separation of Variables and Eigenfunction and Expansion
We credit [2] for a second solution to the heat equation in a bounded domain x ∈ (0, l) for all time t > 0. If we are given initial conditions u(0, t) = u(l, t) = 0 and u(x, 0) = φ(x) then we can separate variables and write u as the product of one function of time only and one function of position only
Using the same method we used to solve the wave equation, we plug in this new function to the heat equation
and we find that both sides must equal a constant
These are ordinary differential equations whose solutions are given by
The boundary conditions imply D = 0 and We can find a general equation for u(x, t) by taking the in nite sum of all of the solutions
As in the case of the wave equation we can solve for the coeffcients by using our initial value function then using the same integration technique used in the solution to the wave equation.
Acknowledgments. It is a pleasure to thank my mentors, Jessica Lin and Yan Zhang, for their help and guidance.
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1. What is the wave equation? |
2. What is the method of separation of variables for the wave equation? |
3. How does the method of separation of variables work for the wave equation? |
4. What are the boundary and initial conditions in the context of the wave equation? |
5. What are the main applications of the wave equation? |
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