MMM SEMINAR NCAR
Direct
Numerical Simulation
of Wind Waves Generation Processes
Civil Engineering Department
We develop an air-water coupled direct numerical simulation model to
investigate the initial wave growing process at air-water interface. The coupled model satisfies the continuities
of velocity and stress simultaneously at the interface and hence captures the
interaction of air and water motions and wave growth processes. The results show that the wavelength of
fastest growing waves agrees with laboratory measurements and the flow fields
reveal very different characteristics during the turbulence-dominated and the
wave-dominated stages.
In this presentation, we will show the animation of wave growth. We will examine the pressure fields in both air and water for wave growth mechanism. Comparing the wave growth mechanism to previous theoretical works, we will show that it agrees with Belcher & Hunt’s (1993) theory that proposes the feedback mechanism between waves and pressure fluctuations in the air for exponential wave growth. Sensitivity tests of the effect of turbulence in the water and of the surface tension show no significant influence on wave growth process.
PLEASE NOTE LOCATION
Refreshments
NCAR-Foothills Laboratory
Bldg 2, Rm. 1001