Nowadays high-performance computing is taking an increasingly central role in scientific research while computer architectures are becoming more heterogeneous and complex with different parallel programming models and techniques. Under this scenario, the only way to successfully exploit a high-performance computing system requires that computer and domain scientists work closely towards producing applications to solve domain problems, ensuring productivity and performance at the same time. Facing such purpose, Saiph is a domain specific language designed to ease the task of simulating complex systems characterized by partial differential equations, focused on computational fluid dynamics. Saiph allows to model real physical systems providing numerical method and high-performance computing expertise in a transparent and automated fashion.