We analyzed the airflow when the vehicles pass each other using the moving boundary problem.
It is known that there are significant fluctuations in speed and pressure before and after trains pass each other in narrow spaces such as tunnels and subway stations. This is very important for the design of vehicles, tunnels, and associated structures. In this analysis, we simulated the airflow and pressure fluctuations affecting the surroundings when the vehicles pass each other, using a moving boundary problem. For more details, please download the catalog.
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【Analysis Model and Conditions】 - The analysis space is a tunnel with a length of 200.0m, a width of 12.0m, and a height of 5.0m. - Two trains moving relative to each other are 100.0m long, 2.8m wide, and 4.0m high. - It is assumed that both trains are traveling at 22.2m/sec (80km/h) and will pass each other. - The total number of grids is 650×77×42=2,102,100. 【Analysis Results】 - The pressure distribution around the train bodies during the passing, along with velocity vectors and wind speed distribution, is illustrated. → Just before the trains pass each other, the pressure reaches a peak, and simultaneously changes sharply from positive pressure to negative pressure. → In the wind speed distribution, turbulence generated after the train bodies pass is confirmed at the rear of the vehicles (near the center of the space). - This method also allows for easy modification of train shapes, station structures, and train speeds for analysis. ● For more details, please contact us or download the catalog.
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In environmental simulation, we are engaged in the independent development and sale of a three-dimensional fluid analysis program, as well as contract analysis services using this software. For over a decade, we have been involved in thermal fluid analysis in fields such as architecture, civil engineering, machinery, and electronics, handling numerous analyses and accumulating a wealth of know-how and knowledge. Our diverse analysis and visualization functions, honed through practical experience, have received high praise as CFD software from many companies and research institutions. ● Import function for BIM-compatible CAD data such as Revit and DXF ● Import function for geographic information system (GIS) data ● SuperCartesian function that freely represents diagonal boundaries and complex curved surfaces ● High-speed, high-precision radiation calculations and high-precision turbulence analysis using DNS ● Moving boundary problem analysis function that accommodates the movement of multiple objects in space ● User-friendly interface and easy-to-understand animation features Of course, we also provide software support and accept contract analyses. Focusing on air conditioning ventilation and wind environment analysis, we offer high cost-performance solutions for a wide range of problems, from simple and small-scale issues to complex and large-scale analyses. We look forward to your visit, along with our extensive analysis case studies.
