A mesoscale model application to fire weather winds

1999 ◽  
Vol 9 (4) ◽  
pp. 255 ◽  
Author(s):  
José A. Gómez-Tejedor ◽  
María J. Estrela ◽  
Millán M. Millán
Keyword(s):  
Wind Field ◽  
Mediterranean Basin ◽  
Mesoscale Model ◽  
Model Simulation ◽  
Wind Flow ◽  
Fire Weather ◽  
Fire Event ◽  
Important Conclusion ◽  
Model Application ◽  
Simulation Results

In this work, a mesoscale model has been used to simulate the wind flow in a real fire situation in the Spanish Mediterranean basin in July 1991. The model simulation results for the wind field are shown, and compared to the fire evolution, and to some real observations taken in the area during the fire event. The most important conclusion is that, in spite of the presence of the fire, the mesoscale model was still able to predict the local winds accurately without taking the fire heating processes into account.

scholarly journals Three-Dimensional Wind Field Construction and Wind Turbine Siting in an Urban Environment

Fluids ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 137 ◽  
Author(s):  
Mingrui Liu ◽  
Xiuling Wang
Keyword(s):  
Wind Turbine ◽  
Urban Environment ◽  
Wind Field ◽  
Three Dimensional ◽  
Turbulence Models ◽  
Reynolds Stress Model ◽  
Urban Environments ◽  
Urban Region ◽  
Wind Flow ◽  
Simulation Results

Three-dimensional urban wind field construction plays an important role not only in the analysis of pedestrian levels of comfort but also in the effectiveness of harnessing wind energy in an urban environment. However, it is challenging to accurately simulate urban wind flow due to the complex land use in urban environments. In this study, a three-dimensional numerical model was developed for urban wind flow construction. To obtain an accurate urban wind field, various turbulence models, including the Reynolds stress model (RSM), k-ω shear stress transport (SST), realizable k-ε, and (Re-Normalisation Group (RNG) k-ε models were tested. Simulation results were compared with experimental data in the literature. The RSM model showed promising potential in simulating urban wind flow. The model was then adopted to simulate urban wind flow for Purdue University Northwest, which is located in the Northwest Indiana urban region. Based on the simulation results, the optimal location was identified for urban wind turbine siting.

scholarly journals Ozone, Temperature, and Wind Field Measurements in a Tropopause Fold: Comparison with a Mesoscale Model Simulation

1999 ◽  
Vol 127 (11) ◽  
pp. 2641-2653 ◽  
Author(s):  
F. Ravetta ◽  
G. Ancellet ◽  
J. Kowol-Santen ◽  
R. Wilson ◽  
D. Nedeljkovic
Keyword(s):  
Wind Field ◽  
Mesoscale Model ◽  
Model Simulation ◽  
Field Measurements

scholarly journals Numerical simulation of wind field and sand flux in crescentic sand dunes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Huiwen Zhang ◽  
Zhen Wu ◽  
Jing Hu ◽  
Zhiping Zhang ◽  
Bin Xiao ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Wind Field ◽  
Sand Dune ◽  
Eddy Currents ◽  
Sand Dunes ◽  
Turbulent Intensity ◽  
Leeward Side ◽  
Wind Flow ◽  
Simulation Results ◽  
Sand Flux

AbstractSand flux is the key factor to determine the migration of sand dunes and the erosion to the surrounding environment. There are crescent-shaped sand dunes of various scales in the desert, and there are significant differences in spatial wind field and sand flux among them. However, due to the difficulty of monitoring, it is difficult to continuously observe the spatial wind field and sand flux around the larger crescentic dunes. On the basis of the Reynolds-Average Navier–Stokes (RA-NS) equation and the stress and sand flux model, the distribution of wind field and sand flux of a circular dune with a height of 4.2 m and a length of about 100 m during the four evolutionary periods of the evolution into a crescentic dune was simulated in this study. By comparing with the measured results, we verified that the closer to the leeward side, the more the simulated values of the velocity in wind field and sand flux were in line with the measured results. In order to further analyze the influence of the height of dune and other relevant parameters on sand flux, we simulated the influence on wind field and sand flux by changing the air viscosity and wind velocity of upper boundary. We found that the air viscosity mainly affected the amount of deposited sand on the leeward side of sand dune, while the increase of wind velocity would undoubtedly increase the sand flux of the whole sand dune. In addition, the simulation results also showed that the influence of changes in height of dune on the turbulent intensity of leeward side was very significant, and the turbulent intensity increased with the height of dune. The height changes of tall dunes gradually affected the transport of sand caused by wind flow behind the leeward side because that the rotation of the wind flow would form new vortexes at the large pores behind the leeward side, which would increase the turbulent energy in space and thus would increase the distance of migration of the lifting sand. While the low sand dunes could not form extra small vortexes at the bottom of the leeward side, so the wind velocity was small and the eddy currents behind the leeward side were more stable. The simulation results indicated that wind velocity was not the only reason for increasing the amount of sand flux, and the fluctuation of wind flow caused by turbulence could also stimulate the movement of sand particles on the ground.

Integration of Computational Fluids Dynamics and Virtual Reality Visualization for Constructing the Wind Field

2011 ◽  
Author(s):  
Lu Lu ◽  
Xiuling Wang
Keyword(s):  
Virtual Reality ◽  
Statistical Analysis ◽  
Virtual Environment ◽  
Wind Field ◽  
Cfd Simulation ◽  
Wind Flow ◽  
Wind Condition ◽  
Irregular Terrain ◽  
Geometry Model ◽  
Simulation Results

3-D wind field models were developed for constructing 3-D wind fields in an urban wind condition and over irregular terrain. The virtual environment is used to visualize the simulation results. Simulation results based on statistical input data were obtained for 3-D urban wind flow over the Classroom and Office (CLO) building at Purdue University Calumet (PUC). The objective for this project was to construct the 3D wind field around the roof of the CLO building in order to analyze the wind condition and identify a suitable installation area which would have relatively more wind power but less turbulence for the wind turbine. By using the virtual reality (VR) technique, the simulation results can be clearly and vividly shown in a virtual environment that would not be as limited as traditional two-dimensional views. Statistical analysis was based on the wind data that was recorded by a sensor located on the roof of the CLO building. Specific wind conditions, which were obtained from the statistical analysis, were applied to simulation cases for the wind flow around a 3-D geometry model of the CLO building. In addition, different wind directions were applied in the Fluent program. After the CFD simulation results were exported, the virtual reality technique was used to visualize the simulation results, which can be observed intuitively. Visualization of simulation results are easier to be observed and be analyzed.

Investigation on penetration model of shaped charge jet in water

2016 ◽  
Vol 30 (02) ◽  
pp. 1550268 ◽  
Author(s):  
Jinwei Shi ◽  
Xingbai Luo ◽  
Jinming Li ◽  
Jianwei Jiang
Keyword(s):  
Numerical Simulation ◽  
Theoretical Model ◽  
Model Simulation ◽  
Theoretical Models ◽  
Theoretical Research ◽  
Water Medium ◽  
Simulation Results ◽  
Jet Penetration ◽  
The Impact ◽  
Penetration Velocity

To analyze the process of jet penetration in water medium quantitatively, the properties of jet penetration spaced target with water interlayer were studied through test and numerical simulation. Two theoretical models of jet penetration in water were proposed. The theoretical model 1 was established considering the impact of the shock wave, combined with the shock equation Rankine–Hugoniot and the virtual origin calculation method. The theoretical model 2 was obtained by fitting theoretical analysis and numerical simulation results. The effectiveness and universality of the two theoretical models were compared through the numerical simulation results. Both the models can reflect the relationship between the penetration velocity and the penetration distance in water well, and both the deviation and stability of theoretical model 1 are better than 2, the lower penetration velocity, and the larger deviation of the theoretical model 2. Therefore, the theoretical model 1 can reflect the properties of jet penetration in water effectively, and provide the reference of model simulation and theoretical research.

scholarly journals Eden Model Simulation of Re-Epithelialization and Angiogenesis of an Epidermal Wound

Processes ◽  
2018 ◽  
Vol 6 (11) ◽  
pp. 207
Author(s):  
Ephraim Agyingi ◽  
Luke Wakabayashi ◽  
Tamas Wiandt ◽  
Sophia Maggelakis
Keyword(s):  
Model Simulation ◽  
Cutaneous Wound Healing ◽  
Epidermal Stem Cells ◽  
Wound Edge ◽  
Wound Area ◽  
Cutaneous Wound ◽  
Simulation Results ◽  
Eden Model ◽  
And Migration ◽  
Proliferation And Migration

Among the vital processes of cutaneous wound healing are epithelialization and angiogenesis. The former leads to the successful closure of the wound while the latter ensures that nutrients are delivered to the wound region during and after healing is completed. These processes are regulated by various cytokines and growth factors that subtend their proliferation and migration into the wound region until full healing is attained. Wound epithelialization can be enhanced by the administration of epidermal stem cells (ESC) or impaired by the presence of an infection. This paper uses the Eden model of a growing cluster to independently simulate the processes of epithelialization and angiogenesis in a cutaneous wound for different geometries. Further, simulations illustrating bacterial infection are provided. Our simulation results demonstrate contraction and closure for any wound geometry due to a collective migration of epidermal cells from the wound edge in fractal form and the diffusion of capillary sprouts with the laying down of capillary blocks behind moving tips into the wound area.

scholarly journals Simulation of Storm Surge in Seto Inland Sea with Wind Field Estimated by Empirical Typhoon Model and Mesoscale Model

2007 ◽  
Vol 54 ◽  
pp. 286-290 ◽  
Author(s):  
Hiroyasu KAWAI ◽  
Koji KAWAGUCHI ◽  
Tatsuo OHKAMA ◽  
Nobuaki TOMODA ◽  
Yukimasa HAGIMOTO ◽  
...  
Keyword(s):  
Storm Surge ◽  
Wind Field ◽  
Mesoscale Model ◽  
Seto Inland Sea

Design of Control of DC Motor

2014 ◽  
Vol 611 ◽  
pp. 325-331
Author(s):  
Ľubica Miková ◽  
Michal Kelemen ◽  
Vladislav Maxim ◽  
Jaromír Jezný
Keyword(s):  
Mathematical Model ◽  
Virtual Environment ◽  
Computer Technology ◽  
Current Practice ◽  
Scientific Literature ◽  
Model Simulation ◽  
Graphical Interface ◽  
Dc Motors ◽  
Matlab Program ◽  
Simulation Results

In current practice the use of mathematical models is substantially widespread, reason being the recent increase in development of programs for this purpose, with the option of model simulation in a virtual environment, proportional to the evolving computer technology. The article contains a mathematical model created using Matlab program. The simulation results are compared with scientific literature that addresses DC motors and evaluated. For simplicity, a graphical interface was created.

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