Natl. Ctr. for Phys. Acoust., Univ. of Mississippi, University, MS 38677
Inst. for Microstruct. Sci., Natl. Res. Council, Ottawa, ON K1A 0R6, Canada
Kenneth E. Gilbert
Lucy J. Ameling
Penn State Univ., State College, PA 16804
An ``integrated-turbulence'' phase screen method has been developed to efficiently treat sound propagation through turbulence having both small-scale and large-scale structure [X. Di and K. E. Gilbert, J. Acoust. Soc. Am. 92, 2404 (A) (1992)]. In this paper, the method is used with two different parabolic equation (PE) algorithms: a PE based on a Fourier transform, split-step range step and a PE based on a Crank--Nicolson range step. It is shown that the phase-screen approach allows one to take advantage of the much longer range step possible with the Fourier method and thereby speed up the calculation by a factor of approximately 100 relative to the Crank--Nicolson result. Consequently, with the phase-screen method and the Fourier PE, it is practical to directly compute the statistics of the fluctuations in the acoustic field. Results are shown from such calculations and comparisons are made with available experimental results.