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Streamlined CFD simulation framework to generate wind-pressure coefficients on building facades for airflow network simulations

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Building Simulation 2021年第4期14卷 1189-1200页

作者： timur dogan Patrick Kastner Cornell University Department of ArchitectureEnvironmental Systems LaboratoryEast Sibley HallIthacaNY14850USA

Building energy modeling software generally comes with capable airflow network solvers for natural ventilation evaluation in multi-zone building energy models. These approaches rely on arrays of pressure coefficients representing different wind directions derived from simple box-shaped buildings without contextual obstructions. For urban or obstructed sites, or more complex building shapes, however, further evaluation is needed to avoid geometric oversimplification. In this study, we present an automated and easy-to-use simulation workflow for OpenFOAM-based exterior airflow simulations to generate arrays of pressure coefficients for arbitrary building shapes and contextual situations. The workflow is compared to other methods commonly used to obtain pressure coefficients for natural ventilation analysis. Finally, we assess for which climate zones and building types modelers should rely on more accurate CFD-based pressure coefficients and where it may be justifiable to rely on easier and readily available analytical approaches to determine pressure coefficients. Results suggest that existing workflows lead to significant error in predicted comfort hours for climates in the Global South and modelers should consider CFD-based facade pressure coeficients.

关键词： natural ventilation airflow networks EnergyPlus pressure coefficients computational fluid dynamics

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Recent progress in CFD for naval architecture and ocean engineering

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Journal of Hydrodynamics 2015年第1期27卷 1-23页

作者： STERN Frederick WANG Zhaoyuan YANG Jianming SADAT-HOSSEINI Hamid MOUSAVIRAAD Maysam BHUSHAN Shanti DIEZ Matteo YOON Sung-Hwan WU Ping-Chen YEON Seong Mo dogan timur KIM Dong-Hwan VOLPI Silvia CONGER Michael MICHAEL Thad XING Tao THODAL Robert S. GRENESTEDT Joachim L. IIHR-Hydroscience and Engineering University of Iowa Center for Advanced Vehicular Systems Mississippi State University CNR-INSEAN Department of Mechanical Engineering University of Idaho Department of Mechanical Engineering and Mechanics Lehigh University

An overview is provided of CFDShip-Iowa modeling, numerical methods and high performance computing （HPC）, including both current V4.5 and V5.5 and next generation V6. Examples for naval architecture highlight capability and needs. High fidelity V6 simulations for ocean engineering and fundamental physics describe increased resolution for analysis of physics of fluids. Uncertainty quantification research is overviewed as the first step towards development stochastic optimization.

关键词： CFD naval architecture ocean engineering

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Intraperitoneal dedifferentiated liposarcoma:A case report

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World Journal of Gastroenterology 2008年第38期14卷 5927-5929页

作者： Ali Karaman Mehmet Esref Kabalar nder zcan timur Koca dogan Nasir Binici Department of Medical Genetics State HospitalErzurum 25240 Turkey Department of Pathology State HospitalErzurum 25240 Turkey Department of General Surgery State HospitalErzurum 25240 Turkey Department of Radiation Oncology State HospitalErzurum 25240 Turkey Department of Internal Medicine State HospitalErzurum 25240 Turkey

Dedifferentiated liposarcoma is a variant of liposarcoma with a more aggressive course. Mutations of the p53 gene have been found in different types of soft tissue sarcoma. It is generally accepted that p53 mutations in human malignant tumors are often related to a poor prognosis. In our case, analysis of p53 gene mutation in tumor samples was performed. p53 gene mutation was observed in dedifferentiated tumor tissue samples but not in well-differentiated tumor tissue samples. It has been reported that p53 gene mutation occurs most commonly in the retroperitoneum and rarely in other anatomic locations. Herein we report a case of dedifferentiated liposarcoma located at intraperitoneum.

关键词：腹膜内反分化脂肪肉瘤 p53基因基因突变基因治疗

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