“…In operation, the oil heats up; therefore, it is necessary to remove heat by installing an oil cooler, the geometry of which directly affects the thermal efficiency of the device [Tsygankov 2013]. Currently, the problem of choosing the form of oil cooler ribbing, as well as optimizing their design parameters, remains relevant because of the wide industrial use of hydraulic units and electric motors [Hruzik 2019, Kozubkova 2019. Their functioning is impossible without sufficient cooling due to overheating of elements and, as a consequence, their subsequent deformation and destruction [Taradai 2003, Zhinov 2013, Dmitriev 2017].…”