Abstract Direct numerical simulations are performed to compare the evolution of turbulent stratified shear layers with different density gradient profiles at a high Reynolds number. The include uniform stratification, two-layer hyperbolic tangent profile and composite these two profiles. All have same initial bulk Richardson number ( $$Ri_{b,0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math...

The outer layer dynamics of a high-Reynolds-number boundary recovering from non-equilibrium is studied utilising the multi-resolution approach zonal detached eddy simulation mode 3. conditions are obtained separation over rounded step enhancing turbulent production, and recovery happens during redevelopment after reattachment at high Reynolds numbers ( $Re_{\theta,max}\approx 24{,}000$ ). Most ...

Already published studies found that 20% of the atmospheric pollution variations are linked to local meteorology. This relationship may be more important in places with dense populations such as Latin American cities since topography and fast multiscale changes part tropical climate. Even so, this possibility has not been addressed previous studies. research aims characterize between climate va...

An experimental study was conducted to characterize the dynamic wind loads and evolution of the unsteady vortex and turbulent flow structures in the near wake of a horizontal axis wind turbine model placed in an atmospheric boundary layer wind tunnel. In addition to measuring dynamic wind loads (i.e., aerodynamic forces and bending moments) acting on the wind turbine model by using a high-sensi...

Abstract Integrated quadrant analysis is a novel technique to identify and characterize the trajectory strength of turbulent coherent structures in atmospheric surface layer. By integrating three-dimensional velocity field characterized by traditional with respect time, history individual can be preserved Eulerian turbulence measurements. We develop method ejection phase based on kinetic energy...

Abstract. While the wind farm parameterization by Fitch et al. (2012) in Weather Research and Forecasting (WRF) model has been used evaluated frequently, explicit wake (EWP) Volker (2015) is less well explored. The openly available high-frequency flight measurements from Bärfuss (2019a) provide an opportunity to directly compare simulation results EWP scheme with situ measurements. In doing so,...

Advancements in image-based computational modeling are producing increasingly more realistic representations of vasculature and hemodynamics, but so far have not compensated for cardiac motion when imposing inflow boundary conditions. The effect of cardiac motion on aortic flow is important when assessing sequelae in this region including coarctation of the aorta (CoA) or regurgitant fraction. ...

The systematic creation of gaps within canopies results in fragmentation and the architecture of fragmented canopies differs substantially from non-fragmented canopies. Canopy fragmentation leads to spatial heterogeneity in hydrodynamics and therefore heterogeneity in the sheltering of canopy communities. Identifying the level of instability due to canopy fragmentation is important for canopies...

To help advance the understanding of cloud life cycle and improve model skill in representing clouds, Deng et al. (2003a and b) investigated cloud processes, and developed a mass-flux-based shallow/deep convection parameterization (SCP, hereafter referred as the Penn State SCP) scheme that involves all aspects of the cloud life cycle, including dynamics, microphysics and radiation. In the Penn ...

Atmospheric convective boundary layer (CBL) entrainment is the downward mixing of free atmospheric air into the CBL as the CBL grows. Primarily, the CBL entrainment is driven by the buoyancy production of turbulence kinetic energy (TKE) due to heating of the lower surface or cooling at the CBL top. The effects of shear-generated turbulence in the CBL are secondary. However, cases of a purely bu...