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In this paper a new scalable hydrodynamic code GPUPEGAS (GPU-acceleratedPErformance Gas Astrophysic Simulation) for simulation of interacting galaxiesis proposed. The code is based on combination of Godunov method as well as onthe original implementation of FlIC method, specially adapted forGPU-implementation. Fast Fourier Transform is used for Poisson equationsolution in GPUPEGAS. Software implementation of the above methods was testedon classical gas dynamics problems, new Aksenov's test and classicalgravitational gas dynamics problems. Collisionless hydrodynamic approach wasused for modelling of stars and dark matter. The scalability of GPUPEGAScomputational accelerators is shown.

A new GPU-accelerated hydrodynamical code for numerical simulation of interacting galaxies