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This paper supports a concerted effort towards validating an unstructured finite volume methodology for combined flow, thermal and stress analysis of turbine blades. In this part, CFD and conjugate heat transfer solutions are compared against measured surface pressure and heat transfer profiles on the C3X turbine. Sensitivities of the prediction to inlet turbulence levels and laminar-to-turbulent boundary layer transition are also presented. The general framework of the paper describes an integrated system incorporating three important analysis components with respect to CAE analysis of...
Ensuring the thermal comfort of passengers is a crucial concern for passenger vehicle cabins. Passenger comfort is influenced by factors including the performance of the HVAC system, exposure to solar and thermal radiation, the thermal conductivity of the materials used in the cabin and the humidity of the surrounding air. A reliable approximation of thermal comfort parameters requires accurate numerical representation of all of these physical phenomena. This can be achieved by utilising strongly coupled solution of radiation, conduction and thermal fluid dynamics. In the present study,...
Thermal fatigue is a degradation mechanism induced on the primary piping system of a nuclear power plant. Consequences of thermal fatigue are often critical, ranging from structural damage to a complete shut-down as happened with the French pressurized water reactor (PWR) Civaux in 1998. Thermal fatigue has been a very persistent problem and has also occurred in the Japanese PWR Tsuruga-2 in 1999, and the Japanese PWR Tomari-2 in 2003. Hence, it is considered to be a serious safety concern and is seen as one of the most influential parameters on the ageing and life management of nuclear power...
To allow the detailed analysis of the two-phase coolant flow and heat transfer phenomena in a Boiling Water Reactor fuel bundle the CFD-BWR model is being developed for use with the commercial code STAR-CD which provides general two-phase flow modeling capabilities. The paper reviews the key boiling phenomenological models, describes the overall strategy adopted for the combined CFD-BWR and STAR-CD boiling models validation and presents results of a set of experiment analyses focused on the validation of specific models implemented in the code. The location of vapor generation onset, axial...
Verifying numerical predictions with experimental data is an important aspect of any modeling studies. In the case of the lung, the absence of direct in vivo flow measurements makes such verification almost impossible. We performed computational fluid dynamics (CFD) simulations in a 3D scaled-up model of an alveolated bend with rigid walls that incorporated essential geometrical characteristics of human alveolar structures and compared numerical predictions with experimental flow measurements made in the same model by particle image velocimetry (PIV). Flow in both models was representative of...
This paper presents results of a research project within Heerema Marine Contractors to determine added mass and damping coefficients of suction piles using CFD. Analyses have been performed for suction piles which are fully closed and with open hatches. The results are compared with model tests presented at the OMAE by Ireland et al. (2007) and Roe et al. (2008). Two modeling approaches have been used. The first approach is simulating a forced oscillation by oscillating the flow around a fixed body. The second approach is by using a Dynamic Fluid Body Interaction (DFBI) model simulating a...
FORCE Technology, Grontmij│Carl Bro and Rolls Royce in Denmark are involved in a joint project under DCMT (Danish Centre for Maritime Technology). The goal of the project is to test and demonstrate the capabilities of RANS in connection with flow simulations for different rudder and propeller configurations. Focus is on a complete CFD model for hull, propeller and appendages, which can account for the mutual interaction between the components when the flow field is calculated. In RANS, propellers can be modeled by body-forces as in , but in the present work the real propeller geometry is...
A new meshing methodology for faster simulation of a Body-In-White dipping process
Simulation of complete body-in-white dipping processes demands a special mesh that is able to model complete geometrical features with the least surface cell count on the body, while representing the sheet metal thickness and ensuring mesh continuity among approximately 400 Body-in-White (BIW) components. Currently employed semi-automatic approaches for producing such meshes are often time intensive and involve huge manual effort. Therefore, a new meshing methodology is developed in STAR-CCM+ with the help of Java automation API and pipeline meshing technology which has automated the surface...
Discrete Element Methods in STAR-CCM+
Dense granular systems are very common natural phenomenon. Sand, pebbles, soil, seeds and powders are all examples of granular flows. Whilst the modeling of granular flows with Eulerian methodology had some success, there is still no known constitutive relation that governs dense granular flow based on grain-scale physics. Recent architecture advances and access to CPU power enables to use granular flow modeling based on Discrete Element Model (DEM) both, for dry granular flows and for flows of particles coupled with traditional CFD solvers. This presentation introduces the DEM simulation...

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