I read the whole list of this question: Where can one obtain good data sets/test problems for testing algorithms/routines? But the answers are in different areas and I want to ask a specific area.
I am looking for resting problems for wave equation, telegraph equation or Klein-Gordon equation, etc. What they have in common is that they are
second-order linear hyperbolic partial differential equations. By testing problem, I mean those can show how well my numerical algorithms behaved, which is exactly the meaning in the similar question I listed above.