Modelling pollutant dispersion in cities is challenging for air quality models as the urban obstacles have an important effect on the flow field and thus the dispersion. Computational Fluid Dynamics (CFD) models with an additional scalar dispersion transport equation are a possible way to resolve the flowfield in the urban canopy and model dispersion taking into consideration the effect of the ...

In this paper, pollutant dispersion from point source was investigated numerically in an urban area. Numerical simulations were carried out using Computational Fluid Dynamics (CFD) models. The CFD models used for the simulation were based on the steadystate Reynolds-Average Navier-Stoke equations (RANS) with κ-ε turbulence models. A gas pollutant was emitted from a point source within the wake ...

Abstract Accurately obtaining the distribution of open-channel velocity field in hydraulic engineering is extremely important, which helpful for better calculation flow and analysis water characteristics. In recent years, machine learning has been used prediction. However, effective training data-driven models heavily depends on diversity quantity data. this paper, a CFD-based pre-training neur...

Computational fluid dynamics (CFD) modeling of nominally patient-specific cerebral aneurysms is increasingly being used as a research tool to further understand the development, prognosis, and treatment of brain aneurysms. We have previously developed virtual angiography to indirectly validate CFD-predicted gross flow dynamics against the routinely acquired digital subtraction angiograms. Towar...

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...

During the past decades, numerous computational fluid dynamics (CFD) studies, constructed from CT or MRI images, have simulated human nasal models. As compared to rhinomanometry and acoustic rhinometry, which provide quantitative information only of nasal airflow, resistance, and cross sectional areas, CFD enables additional measurements of airflow passing through the nasal cavity that help vis...

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...

In an attempt to reduce the high computational efforts for dynamic thermal simulations using Computational Fluid Dynamics (CFD) the authors have recently developed an adaptive freeze-flow method (i.e. freezing of flow equations over variable time periods). This paper documents the work that has been carried out to predict the radiative surface heat transfer in dynamic thermal building processes...

This paper examines the effect of various combustion models when predicting the environment in a building arising from fire in a room. The use of a stoichiometric combustion model will usually over-predict the efficiency of the combustion process in the fuel-rich areas and hence over-predict the temperature field. A modified combustion model presented in this paper can improve the predicted res...