As gases are declared in the XML files different from liquids, a certain grade of compressibility should be expectable. Within chapter 3.13 of "DualSPHysics_v4.0_LiquidGas_GUIDE.pdf" the density of the fluid is linked to the pressure by means of the Tait equation of state.
Anyway, there is no indication in the guides about what maximum Mach number must be limiting the simulations.
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Anyway, there is no indication in the guides about what maximum Mach number must be limiting the simulations.