- document
-
Zou, P. (author), Kim, Taeksang (author), Bricker, J.D. (author), Uijttewaal, W.S.J. (author)The modelling of complex free surface flows is challenging due to the mobility and deformability of the interface and air entrainment characteristics, which are highly affected by turbulence. With the framework of Reynolds averaged Navier–Stokes (RANS) models and the volume of fluid (VOF) method, turbulence quantities at the air–water...journal article 2023
- document
-
Basu, S. (author), Holtslag, Albert A.M. (author)In this paper, we revisit a well-known formulation of temperature structure parameter (CT2), originally proposed by V. I. Tatarskii. We point out its limitations and propose a revised formulation based on turbulence variance and flux budget equations. Our formulation includes a novel physically-based outer length scale which can be estimated...journal article 2022
- document
-
Research Progress on Convective Heat Transfer Characteristics of Supercritical Fluids in Curved TubeLiu, Xinxin (author), Li, Shuoshuo (author), Liu, Liang (author), He, Chao (author), Sun, Zhuang (author), Özdemir, F. (author), Aziz, Muhammad (author), Kuo, Po-Chih (author)Because of their compact structure, ease of processing and higher heat transfer coefficient, curved-tube heat exchangers are widely applied in various industry applications, such as nuclear power systems, solar-powered engineering, aircraft engine cooling systems and refrigeration and cryogenic systems. Accurate knowledge about the heat transfer...journal article 2022
- document
-
Basu, S. (author), Holtslag, Albert A.M. (author)In this study, the stability dependence of turbulent Prandtl number (Pr<sub>t</sub>) is quantified via a novel and simple analytical approach. Based on the variance and flux budget equations, a hybrid length scale formulation is first proposed and its functional relationships to well-known length scales are established. Next, the ratios of...journal article 2021
- document
-
Sime, Nathan (author), Maljaars, J.M. (author), Wilson, Cian R. (author), van Keken, Peter E. (author)Tracer methods are widespread in computational geodynamics for modeling the advection of chemical data. However, they present certain numerical challenges, especially when used over long periods of simulation time. We address two of these in this work: the necessity for mass conservation of chemical composition fields and the need for the...journal article 2021
- document
-
Flores, Raúl P. (author), Rijnsburger, S. (author), Horner-Devine, Alexander R. (author), Kumar, Nirnimesh (author), Souza, Alejandro J. (author), Pietrzak, J.D. (author)This study investigates the influence of tidal straining in the generation of turbidity maximum zones (TMZ), which are observed to extend for tens of kilometers along some shallow, open coastal seas. Idealized numerical simulations are conducted to reproduce the cross-shore dynamics and tidal straining in regions of freshwater influence ...journal article 2020
- document
-
Basu, S. (author), He, Ping (author), DeMarco, Adam W. (author)We use a database of direct numerical simulations to evaluate parametrizations for energy dissipation rate in stably stratified flows. We show that shear-based formulations are more appropriate for stable boundary layers than commonly used buoyancy-based formulations. As part of the derivations, we explore several length scales of turbulence...journal article 2020
- document
-
Dai, Y. (author), Basu, S. (author), Maronga, Björn (author), de Roode, S.R. (author)We have identified certain fundamental limitations of a mixing-length parametrization used in a popular turbulent kinetic energy-based subgrid-scale model. Replacing this parametrization with a more physically realistic one significantly improves the overall quality of the large-eddy simulation (LES) of stable boundary layers. For the range...journal article 2020
- document
-
Picelli, R. (author), van Dijk, R. (author), Vicente, W.M. (author), Pavanello, R. (author), Langelaar, Matthijs (author), van Keulen, A. (author)This paper presents an evolutionary structural topology optimization method for the design of completely submerged buoyant modules with design-dependent fluid pressure loading. This type of structure is used to support offshore rig installation and pipeline transportation at all water depths. The proposed optimization method seeks to identify...journal article 2017
- document
-
Wei, X. (author), Schuttelaars, H.M. (author), Schramkowski, G.P. (author)Understanding salt dynamics is important to adequately model salt intrusion, baroclinic forcing, and sediment transport. In this paper, the importance of the residual salt transport due to tidal advection in well-mixed tidal estuaries is studied. The water motion is resolved in a consistent way with a width-averaged analytical model, coupled to...journal article 2016
- document
-
Cenedese, C. (author), Gatto, V.M. (author)Idealized laboratory experiments investigate the glacier–ocean boundary dynamics near a vertical glacier in a two-layer stratified fluid. Discharge of meltwater runoff at the base of the glacier (subglacial discharge) enhances submarine melting. In the laboratory, the effect of multiple sources of subglacial discharge is simulated by introducing...journal article 2016
- document
-
Schulz, E. (author), Schuttelaars, H.M. (author), Grawe, U. (author), Burchard, H. (author)The dependency of the estuarine circulation on the depth-to-width ratio of a periodically, weakly stratified tidal estuary is systematically investigated here for the first time. Currents, salinity, and other properties are simulated by means of the General Estuarine Transport Model (GETM) in cross-sectional slice mode, applying a symmetric...journal article 2015
- document
-
Ooms, G. (author), Pourquie, M.J.B.M. (author), Beerens, J.C. (author)A numerical study has been made of horizontal core-annular flow: the flow of a high-viscosity liquid core surrounded by a low-viscosity liquid annular layer through a horizontal pipe. Special attention is paid to the question how the buoyancy force on the core, caused by a density difference between the core and the annular layer, is...journal article 2013
- document
- De Nijs, M.A.J. (author), Pietrzak, J.D. (author) journal article 2012
- document
-
De Nijs, M.A.J. (author), Pietrzak, J.D. (author)Measurements of turbulent fluctuations of velocity, salinity, and suspended particulate matter (SPM) are presented. The data show persistent countergradient buoyancy fluxes. These countergradient fluxes are controlled by the ratio of vertical turbulent kinetic energy (VKE) and available potential energy (APE) terms in the buoyancy flux equation....journal article 2011
- document
-
Winterwerp, J.C. (author)This paper describes an analysis of the observed up-river transport of fine sediments in the Ems River, Germany/Netherlands, using a 1DV POINT MODEL, accounting for turbulence-induced flocculation and sediment-induced buoyancy destruction. From this analysis, it is inferred that the net up-river transport is mainly due to an asymmetry in...journal article 2010
- document
- Mudde, R.F. (author) journal article 2005
- document
- Hanjalic, K. (author) journal article 2002
- document
- van-Steeg, J.G. (author), Wesseling, P. (author) journal article 1978