Model for Mixture Theory Simulation of Vortex Sand Ripple Dynamics

Bedforms: views and new perspectives from the third international workshop on Marine and River Dune Dynamics (MARID3)

“…Whilst we can attempt to interpret flow depths from bedform size and the distribution of cross-set heights, the nature of the bounding surface perhaps holds new avenues for reconstructing bedform size. Penko et al, 2011), and the linking of this to preserved cross-strata in the deposits. It is also clear that much of our knowledge concerning the preservation potential of bedforms comes from laboratory experiments.…”

“…Quantification of bedform preservation also needs application and development in the modeling of sediment transport and deposition across bedforms (e.g. Penko et al, 2011), and the linking of this to preserved cross-strata in the deposits. Such coupled modeling, that must also incorporate testing against both laboratory and field experiments, holds significant promise for more realistic three-dimensional modeling of bedforms and the heterogeneity of their deposits.…”

Filter width and uncertainty estimation in continuum modeling of particle phases

“…Hsu et al, 2003;Penko et al, 2011) is parameterized using theoretical (Jenkins and Savage, 1983;Lun et al, 1984) or empirical (Krieger, 1972;Richardson and Zaki, 1954) functions of the ''local'' volumetric concentration. The grid step in such continuum models is typically chosen in an ad hoc manner and is often comparable to the particle diameter.…”

Nearshore dynamics of artificial sand and oil agglomerates

“…Models capable of resolving fine-scale hydrodynamics and sediment transport within the WBBL include ReynoldsAveraged Navier-Stokes (RANS) models (e.g., Winterwerp, 2001;Bakhtyar et al, 2009;Hsu et al, 2009); Large-Eddy Simulation (LES) models (e.g., Zedler and Street, 2001;Chang and Scotti, 2004;Harris and Grilli, 2012); and Direct Numerical Simulation (DNS), which resolves all scales of turbulent flow without the use of a closure model (e.g., Bhaganagar and Hsu, 2009;Ozedmir et al, 2010). Recent advancements have also included capturing the feedback between sediment and fluid within the WBBL, such as utilizing mixture theory within unfiltered Navier-Stokes equations to capture sand ripple dynamics (Penko et al, 2011(Penko et al, , 2013. Models for resolving the motion of cm-sized particles such as SOAs or cobbles have been developed using balance-of-force approaches assuming the particle is driven primarily by the freestream flow, neglecting influences of the WBBL (e.g., Voropayev et al, 1998Voropayev et al, , 2001, but these models do not capture interactions with bed forms.…”