Two Dimensional FEM Simulation of Ultrasonic ... - COMSOL.com

Effect of Time Steps (∆t)( As per CFL criteria the time steps should be less than ∆x/Cx/C Lfor example, for the maximum element length of λ L /10 thetime steps should be ≤ (λ L /10×C L ) that means if Signal so far obtained is not as expected Major change in the shape of signal Time steps further decreased and solution was checked forconvergenceλL∆xmax=10∆x⇒ ∆t≤C⇒ ∆tmaxL1≤10×fλL=10×CL