Horsepower Lab 2D descriptions Software package that uses Computation Fluid Dynamics to simulate compressible flows through local flow restrictions. It helps to determine total pressure losses & corresponding non-dimensional coefficients as well as discharge coefficients with account for compressibility effects. It is applicable for compressible flows with high Reynolds numbers & for restriction shapes restricted to 2D. More accurate results can be obtained for restrictions with flow separation induced geometrically i. e. where substantial & sudden flow contraction/expansion occurs. Horsepower Lab 2D can be used to tentatively predict the discharge characteristics for real life local flow restrictions like internal combustion engine ports valves etc.