Rossiter[5] derived a semi-empirical equation that predicts the dominant frequency of the cavity flow instability, *f*, where *U* is the freestream flow velocity, *L* is the length of the cavity, *M* is the Mach number, *c*_{o} and *c*_{τ} are the speed of sound outside and inside the cavity respectively, *γ* and *κ* are empirical terms, and *m* is the mode of the oscillation. Using experimental measurements, Rossiter determined that the empirical terms are *γ* = 0.25 and *κ* = 0.66. Subsequent studies have reported *κ* values as low as 0.57 while the value for *γ* has remained consistent.[6]