This paper describes an integrated approach for validating, qualifying and documenting numerical models for simulating complex systems. Although the example used to illustrate the process entails simulations of accident scenarios in the petroleum and process industries by means of computational fluid dynamics (CFD), the methodology is not restricted to any particular model or system. CFD tools ...

Dust emissions can have significant effects on the human health, environment and industry equipment. Understanding the dust generation process helps to select a suitable dust preventing approach and also is useful to evaluate the environmental impact of dust emission. To describe these processes, numerical methods such as Computational Fluid Dynamics (CFD) are widely used, however nowadays part...

In the heavy-frame advanced turbine systems, steam is used as a coolant for turbine blade cooling. The concept of injecting mist into the impinging jets of steam was experimentally proved as an effective way of significantly enhancing the cooling effectiveness in the laboratory under low pressure and temperature conditions. However, whether mist/steam cooling is applicable under actual gas turb...

This paper numerically investigates a 3D mesh independency study of a straight blade horizontal axis tidal turbine modelled using Computational Fluid Dynamics (CFD). The solution was produced by employing two turbulence models, the standard k-ε model and Shear Stress Transport (SST) in ANSYS CFX. Three parameters were investigated: mesh resolution, turbulence model, and power coefficient in the...

BACKGROUND Hemodynamic simulation for quantifying fractional flow reserve (FFR) is often performed in a patient-specific geometry of coronary arteries reconstructed from the images from various imaging modalities. Because optical coherence tomography (OCT) images can provide more precise vascular lumen geometry, regardless of stenotic severity, hemodynamic simulation based on OCT images may be ...

Computational fluid dynamics (CFD) is an important tool in fire safety engineering. CFD is applied in many projects while the global trend is moving towards the implementation of engineering performance-based fire codes. However, questions are always raised on the model credibility. Verification and validation of the CFD predicted results in fire engineering are not yet carried out with systema...

BACKGROUND Hemocompatibility is highly affected by the flow field in Left Ventricular Assistant Devices (LVAD). OBJECTIVE An asymmetric inflow and outflow channel arrangement with a 45° intersection angle with respect to the blood chamber is proposed to approximate the vascular structure of the aorta and left atrium on the left ventricle. The structure is expected to develop uninterruptible v...

In this study we used computational fluid dynamics (CFD) to analyse the therapeutic effect of an oral device (mandibular advancement splint – MAS) that protrudes the lower jaw during sleep on obstructive sleep apnea (OSA). Clinical data of 4 patients were used for CFD analysis, with patient selection being on the basis of their known different treatment responses. Anatomically accurate upper ai...

Abstract: Two modeling approaches, the scaling-law and CFD (Computational Fluid Dynamics) approaches, are presented in this paper. To save on experimental cost of the pilot plant, the scaling-law approach as a low-computational-cost method was adopted and a small scale column operating under ambient temperature and pressure was built. A series of laboratory tests and computer simulations were c...

A modular and integrated optimisation model for the design of underwater vehicles is presented. In the proposed optimisation model two modules (i.e. low fidelity and high fidelity) are incorporated and the basic geometric definition of computer aided design (CAD) is integrated with computational fluid dynamic (CFD) analysis. The hydrodynamic drag is considered as single objective with constrain...