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Tutorial Created in Comsol 4.3 (2012)

R. White, Comsol Acoustics Introduction, 2012 Tutorial Created in Comsol (2012) R. White, Comsol Acoustics Introduction, 2012 Finite Element Analysis (FEA / FEM) Numerical Solution of Partial Differential equations (PDEs). representing the physics. on which to solve the problem. conditions (for static or steady state problems) and initial conditions (for transient problems). W - domain - boundary (or dW) Unknowns u(x,y,z) x y The Mathematical Problem: Independent Variables space and time (x,y,z,t) Dependent Variables unknown field (such as u) R. White, Comsol Acoustics Introduction, 2012 Finite Element Analysis (FEA / FEM) Boundary Conditions.

part in ME139. The Helmholtz equation … you are solving for steady state pressure at a single frequency. • Eigenfrequency : This will allow you to find the acoustic modes of a domain. These are frequencies and corresponding pressure fields where the Helmholtz equation and boundary conditions can be satisfied with no external drive

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