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We present a new fourth-order, finite-volume hydrodynamics code named Apsara.The code employs a high-order, finite-volume method for mapped coordinates withextensions for nonlinear hyperbolic conservation laws. Apsara can handlearbitrary structured curvilinear meshes in three spatial dimensions. The codehas successfully passed several hydrodynamic test problems, including theadvection of a Gaussian density profile and a nonlinear vortex and thepropagation of linear acoustic waves. For these test problems, Apsara producesfourth-order accurate results in case of smooth grid mappings. The order ofaccuracy is reduced to first-order when using the nonsmooth circular gridmapping. When applying the high-order method to simulations of low-Mach numberflows, for example, the Gresho vortex and the Taylor-Green vortex, we discoverthat Apsara delivers superior results to codes based on the dimensionallysplit, piecewise parabolic method (PPM) widely used in astrophysics. Hence,Apsara is a suitable tool for simulating highly subsonic flows in astrophysics.In the first astrophysical application, we perform implicit large eddysimulations (ILES) of anisotropic turbulence in the context of core collapsesupernova (CCSN) and obtain results similar to those previously reported.

APSARA: A multi-dimensional unsplit fourth-order explicit Eulerian hydrodynamics code for arbitrary curvilinear grids