نتایج جستجو برای: flow dynamics
تعداد نتایج: 891655 فیلتر نتایج به سال:
چرخش و پلاسمایی بودن پوش ستاره از عوامل مهم در تحول آن در فاز انقباضی هستند. برار نشان دادن این موضوع مدلی از تحول ستاره را میتوان ارائه کرد که در تطابق زیادی با مشاهدات دارد و برای هر ستاره با هر جرم قابل استفاده است. ستاره را به دو قسمت پوشو هسته تقسیم کرده ایم و همانطور که چرخش نقش اصلی در تشکیل ستاره دارد یک دوران اولیه به ستاره نسبت داده ایم. در این مدل اساس کار بر افزایش سرعت زاویه ای هست...
among the all parameters affecting the performance of a downhole de-oiling hydrocyclone, the investigation of internal flow field deserves more attempts especially in the petroleum industry. in this study, the effects of inlet flow rate, inlet oil volume fraction, and oil droplet diameter on the separation efficiency and pressure drop ratio have been investigated along the hydrocyclone body. al...
this study investigated how group formation method, namely student-selected vs. teacher-assigned, influences the results of the community model of teaching creative writing; i.e., group dynamics and group outcome (the quality of performance). the study adopted an experimental comparison group and microgenetic research design to observe the change process over a relatively short period of time. ...
In this paper, the stability analysis and control design of heterogeneous traffic flow is considered. It is assumed that the traffic flow consists of infinite number of cooperative non-identical vehicular platoons. Two different networks are investigated in stability analysis of heterogeneous traffic flow: 1) inter-platoon network which deals with the communication topology of lead vehicles and...
در این رساله شبیه سازی جریان آشفته همراه با ذرات معلق بروش شبیه سازی گردابه های بزرگ (les) مورد بررسی قرار گرفته است. نگرش پیوند دو سویه که در آن اثرات متقابل ذرات و سیال بر روی هم در نظر گرفته می شود استفاده گردیده است. جهت گسسته سازی مکانی از روش حجم محدود غیرقابل تراکم جهت حل جریان حامل استفاده شده است. حل معادلات ناویر استوکس غیر قابل تراکم از روش تصویر استفاده گردیده است. حل فاز جامد نیز ب...
چکیده ندارد.
Consistent definitions of important variables in pedestrian flow dynamics are proposed. They are based on the definition of similar variables for road traffic flow from the 1960’s by Edie. The definitions are extended to include multi-class flows where pedestrians move in different directions or have different characteristics. The new definitions provide a foundation of already existing crowd f...
in this research, the numerical method of computational fluid dynamics and dimensionless parameter of froude number have been applied to determine the flow regime over ogee spillways.froude number is a dimensionless dynamic parameter calculated using the square root of the ratio of inertia force and gravitational force. considering that the study of the regimes of flow over hydraulic structures...
The biomimetic and hydrodynamic study of aquatic animals is one of the most challenging computational fluid dynamics topics in recent studies due to the complexity of body geometry and the type of flow field. The movement of the aquatic body, and particularly the tail section and the corresponding movement of fluid around the body, causes an unsteady flow and requires a comprehensive study of t...
Several rigorous turbulent models have been developed in the past years and it can be seen that more research is needed to reach a better understanding of their generality and precision by verifying their applications for distinct hydraulic phenomena; under certain assumptions. This survey evaluates the performance of Standard k-ε, Realizable k-ε, RNG k-ε, k-ω and RSM models in predicting flow ...
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