Two different flow fields over two different bodies are dynamically similar if (a) The streamline patterns are geometrically similar; TRUE OR FALSE (b) The non-dimensional distributions such as V/V∞, p/p∞, etc, are the same when plotted against common non-dimensional coordinates TRUE or FALSE? (c) Force coefficients are the same TRUE or FALSE?
Two different flow fields over two different bodies are dynamically similar if
(a) The streamline patterns are geometrically similar; TRUE OR FALSE
(b) The non-dimensional distributions such as V/V∞, p/p∞, etc, are the same when plotted against common non-dimensional coordinates TRUE or FALSE?
(c) Force coefficients are the same TRUE or FALSE?
(d) State the criteria for two flows to be dynamically similar
(e) An airplane flies at 800km/h at 11700m standard altitude where the ambient pressure and temperature are 20.335 kPA and 216.66K respectively. A 1/50 scale model of the airplane is tested in a wind tunnel where the temperature is 288K. Calculate the tunnel test section wind speed and pressure such that force coefficients of the model and prototype are the same. Assume viscosity is proportional to the square root of T. [ Hint: flow is viscous and compressible; equation of state for a perfect gas applies]
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