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Showing 1 to 16 of 16 for “"Wall Function"”.
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Implementation of a trim routine in a rotor model for the numerical simulation of helicopter flow-fields
… Computational grids were created for the near wall modelling approach and wall function approach. Some of the more applicable turbulence models available in the solver were compared. For the wall function approach grids the k - ε, and its variants, the RNG and realizable models were found to be …
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CFD modelling and validation of a large 2-stroke marine diesel engine
… working processes. The turbulence models and the wall functions in the CFD solver were firstly tested using two basic 2D cases to obtain performance results in the modelling of turbulence flow and heat transferring near the wall. It was concluded that the RNG and the realisable Ҡ-Ɛ turbulence …
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Chebyshev spectral method for incompressible viscous flow with boundary layer control via suction or blowing
… Second, a Chebyshev spectral method using the wall function technique was applied to the defect form of the incompressible viscous momentum equation. A turbulent jet profile was computed with N = 40 modes, a number low enough to allow the method's implementation into the MISES framework.
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A Computational Model for Two-Phase Ejector Flow
… such as a mixing length turbulence model and wall function approximation, are discussed. Discretization of the equations by the control volume method and organization of the computer program is described. Code results are shown and compared to experimental data. It is shown that experimental …
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Numerical Modeling of Turbulent Combustion and Flame Spread
… model, various soot models and transpired wall function. Comprehensive numerical simulations have been carried out to study soot formation and oxidation in turbulent buoyant diffusion flames, flame heat transfer and flame spread in fires. The gas temperature and velocity, soot volume …
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A dimensionally split Cartesian cut cell method for Computational Fluid Dynamics
… number turbulent automotive flows using a wall-modelled Large Eddy Simulation (WMLES) approach. A full description is provided of the coupling between the (implicit) LES solution and an equilibrium wall function on the cut cell mesh. The combined methodology is used to compute results for …
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Development and application of low Reynolds number turbulence models for air-cooled electronics
… approach to blend the k — l model used at the wall with the k-e model used to predict the bulk airflow. Validation of these turbulence models was undertaken on eight different test cases. This included the detailed experimental work undertaken by Meinders. Results show that the ke I kl model …
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Comparative analysis of stem carbon partitioning and development in Andropogoneae bioenergy grasses
… to produce enough of it to allow for basic cell wall function. Starch is the most common storage form for excess sugar accumulation; however, plants can also store carbon in the form of sucrose even though it is highly unstable and makes them a target for pests. Typically sucrose is stored in the …
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Parallel implementation and application of particle scale heat transfer in the Discrete Element Method
… stress model and the application of a LES wall function (WMLES) at the tube surface improves the prediction to within ± 20% of the experimental measurements.
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Numerical and experimental study of flow in a gas turbine chamber.
… mesh type and quality effects with enhancement wall treatment and standard wall function effects also addressed for turbulent boundary layers. In this study, four different turbulence models were utilized (S-A, mu-epsilon, (RNG), and (SST) mu-o). The computations were compared with available …
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New integral and differential computational procedures for incompressible wall-bounded turbulent flows
… presented for the simulation of incompressible wall-bounded turbulent flows. First, an integral method based on the strip integral method has been developed for the solution of three-dimensional turbulent boundary-layer flows. The integral equations written in a general form using non-orthogonal …
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Effects of Turbulence Modeling on RANS Simulations of Tip Vortices
… investigations in this work include the study of wall boundary layer treatment and simulating the wake-age of an isolated rotorcraft in hover using a steady-state RANS solver. By comparing skin friction plots over the NACA 0012 airfoil, it is shown that wall functions are most effective in the …
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Effects of surface roughness on the flow characteristics in a turbulent boundary layer
… boundary layers on aerodynamically smooth walls has been clarified over the last decade or so. However, the dynamics of turbulent boundary layers over rough surfaces is much less well known. Nevertheless, there are many industrial and environmental flow applications that require …
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Computational Fluid Dynamic and Rotordynamic Study on the Labyrinth Seal
… with curvature correction, and the scalable wall function. To obtain the optimal mesh and minimize the discretization error, a systematical grid study was conducted including grid independence studies and discretization error estimations. Some of the results were compared with previous …
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Transcriptional Regulation of Azole Antifungal Resistance and Tolerance in Candida Glabrata
… and in one of these (F15) a putative gain-of-function mutation was identified in the single molecule homologue of <em>Saccharomyces cerevisiae</em> transcription factors Pdr1p–Pdr3p. Here we show that disruption of <em>C. glabrata</em> <em>PDR1</em> conferred equivalent fluconazole …
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Thromboelastography in the assessment of coagulation changes in peripheral vascular disease
… aggregation and defective endothelial (arterial wall) function in patients with PVD that leads to thrombosis in arterial circulation thus designating this group of patients as hypercoagulable.‘ Interestingly these patients are not deemed as such in clinical practice as the routine coagulation …