ABSTRACT A Nozzle is a device which is used to control the fluid flow and directions. The design is considered based on the pipe cross sectional area & length of the pipe. It is used for converting the pressure energy into kinetic energy. There are different types of Nozzles used according to the requirement. Most commonly used nozzles are Convergent nozzle, Divergent nozzle and Convergent Divergent Nozzle. Convergent Nozzle is used to increase the pressure of the fluid and it decreases the cross-sectional area. Divergent Nozzle is quite opposite to the convergent nozzle it increases the crosssectional area of the tube to decrease the pressure. Convergent-Divergent Nozzle is the combination of both convergent and divergent nozzles. Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape and the pressure of the stream that emerges from them. Nozzle is used in steam turbines, gas turbines, water turbines and in jet engines, jet propulsion. Nozzles are used for flow measurement as it is used in Venturi meter. Nozzles are used to remove air from a condenser, injectors for pumping feed water to feed water to boilers and also used in artificial fountains. A convergent divergent nozzle with a variable area and profile through which the relative airflow is supersonic is known as supersonic nozzle. The expansion of supersonic flow causes the static pressure and temperature to decrease from the throat to the exit, so the amount of the expansion also determines the exit pressure and temperature. Supersonic nozzles are used in a variety of engineering applications to expand a flow to desired supersonic conditions. Here Supersonic jet nozzle is considered for optimization flow analysis. Aluminum alloy is the metal considered for analysis. Catia is used for designing the nozzle and Ansys is used for analysis of the nozzle. Computational Fluid Dynamics (CFD) is used for flow analysis of the nozzle. Thermal analysis and flow analysis are done using CFD. Boundary conditions like pressure and temperature are applied on the nozzle. As supersonic nozzle has wide variety of applications it is necessary to optimize the flow through a supersonic nozzle with minimum losses. By CFD analysis of supersonic nozzle high concentration of stress, strain and deformation of nozzle is observed. By thermal analysis expansion of high temperature area and deformation due to high temperature is observed. This analysis helps us to improve the nozzle design and to optimize the flow of the fluid through supersonic nozzle. Further, this helps in improvement of efficiency of supersonic nozzle.