Аннотация:UCNS3D is an open-source computational solver for compressible flows on unstructured meshes. Stateof-the-art high-order methods and their associated benefits can now be implemented for industrial-scaleCFD problems due to the flexibility and highly-automated generation offered by unstructured meshes.We present the governing equations of the physical models employed in UCNS3D, and the numericalframework developed for their solution. The code has been designed so that extended to other systemsof equations and numerical models is straightforward. The employed methods are validated towards aseries of stringent well-established test problems against experimental or analytical solutions, where thefull capabilities of UCNS3D in terms of applications spectrum, robustness, efficiency, and accuracy aredemonstrated