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We construct a large family of exact solutions to the hyperbolic system of 3equations of ideal granular hydrodynamics in several dimensions for arbitraryadiabatic index $\gamma$. In dependence of initial conditions these solutionscan keep smoothness for all times or develop singularity. In particular, in the2D case the singularity can be formed either in a point or along a line. For$\gamma=-1$ the problem is reduced to the system of two equations, related to aspecial case of the Chaplygin gas. In the 1D case this system can be written inthe Riemann invariant and can be treated in a standard way. The solution to theRiemann problem in this case demonstrate an unusual and complicated behavior.

Exact solutions with singularities to ideal hydrodynamics of inelastic gases