Hi everyone,

It is a really amazing toolbox for me, a novice in nonlinear acoustics simulation.

I want to similuate the finite-amplitude nonlinear acoustic behaviors of a vibrational objects but with complex geometry. Thus, the non-penetrating conditions of the fluid and the solid surface should be matched. Now, I am not sure whether the k-wave method can deal with this problem well.

By the way, I have read some textbooks about nonlinear acoustics theory, i.e., "Nonlinear acoustics" edited by Hamilton and Blackstock. One question make me quite confused. The commom used nonlinear acoustic models (i.e, Westervelt's euqtions, KZK euqations) were approximated from Euler equation or N-S equation. After using the second-order approximation, the dercived euqtions still includes the nonlinear convective terms, which are diffcult to deal with numerically. So, why have to make this approximation? and directly using the Euler euqation to model the nonlinear acoustic behaviors would be a better choice?

Please help me on the two problems!

Thank you!

Jack Liu