This study investigates the effects of grid resolution on hydroacoustic performance benchmark INSEAN E779A propeller operated in uniform flow, open water and non-cavitating conditions. In numerical calculations, an incompressible hydrodynamic solver together with porous FW-H (Ffowcs-Williams Hawkings) equation is used to predict URN (Underwater Radiated Noise). The first aim within this explore...

This paper is concerned with the numerical simulation of gas flow inside spray dryers, which is known to be highly transient. Experimental evidence presented in the literature to date is acquired either at a scale much smaller than industrial or at a limited number of locations in the system (e.g. the central axis). Alternatively, computational fluid dynamics (CFD) simulation, in particular met...

To overcome this difficulty, various hybrid LES/RANS approaches have been developed, where RANS (Reynolds-averaged Navier-Stokes) equations are solved in the near-wall region while LES is only conducted in the free-shear region away from the wall [Fröhlich and von Terzi 2008]. One of the methods to address this issue is a consistent framework for turbulence modeling, where the filtered and Reyn...

Parameterizations for bottom shear stress are required to predict sediment resuspension from field observations and within numerical models that do not resolve flow the viscous sublayer. This study assessed three observation-based (τb) parameterizations, including (a) sum of surface wave mean current (quadratic) (); (b) log-law (τb = τL); (c) turbulent kinetic energy τTKE); using 2 years a larg...

Wake analysis plays a significant role in wind-farm planning through the evaluation of losses and energy yield. Wind-tunnel tests for wake studies have high costs are time-consuming. Therefore, computational fluid dynamics (CFD) emerges as an efficient alternative. An especially attractive approach is based on solution Reynolds-averaged Navier–Stokes (RANS) equations with two-equation turbulenc...

Large eddy simulation (LES) of the atmospheric boundary layer (ABL) flow over complex terrain is presented with a validation using meteorological tower (met-tower) data through an improved neutral stability sampling approach. The proposed procedure includes condition based on most-likely occurrence time-periods ABL and reduces variabilities conditional wind statistics calculated at met-towers i...

Combustion is a natural phenomenon. It happens in forest, automotive engine and gas cooker. In Computational Fluid Dynamics (CFD), the combustion phenomenon complies with a set of partial differential equations. According to the resolution scale, from big to small, the simulation methods in combustion are Reynolds Averaged Navior Stokes method (RANS), Large Eddy Simulation (LES), and Direct Num...

Recent research has used deep learning to develop partial differential equation (PDE) models in science and engineering. The functional form of the PDE is determined by a neural network, network parameters are calibrated available data. Calibration embedded can be performed optimizing over PDE. Motivated these applications, we rigorously study optimization class linear elliptic PDEs with terms....

This work extends the previous effort in unsteady Reynolds averaged Navier-Stokes (RANS) simulations developed by the ship hydrodynamics group of the University of Iowa Iowa Institute of Hydraulic Research to the capability to predict pitch and heave motions of ships with forward speed in regular head seas. The simulations are performed with CFDSHIP-IOWA, which is a general-purpose, multiblock,...