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A Force-Based Grid Manipulator for ALE Calculations in a Lobe Pump

Journal of Thermal Science 2003年第4期12卷 318-322,370页

作者： john vande voorde rug.ac.be Jan Vierendeels rug.ac.be Erik Dick rug.ac.be Department of Flow Heat and Combustion Mechanics Ghent University Belgium E-mail: John.VandevoordeDepartment of Flow Heat and Combustion Mechanics Ghent University Belgium E-mail: John.VandevoordeDepartment of Flow Heat and Combustion Mechanics Ghent University Belgium E-mail: John.Vandevoorde

In this paper, a time-dependant calculation of flow in a lobe pump is presented. Calculations are performed using the arbitrary Lagrangean Eulerean (ALE) method. A grid manipulator is needed to move the nodes between time steps. The used grid manipulator is based on the pseudo-force idea. This means that each node is fictitiously connected with its 8 neighbours via fictitious springs. The equilibrium of the resulting pseudo spring forces defines the altered position of the nodes. The grid manipulator was coupled with a commercial flow solver and the whole was tested on the flow through a three-lobe lobe pump. Results were obtained for a rotational speed of 460 rpm and incompressible silicon oil as fluid.

关键词： ALE arbitrary Lagrangean Eulerean moving grids lobe pump.

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一种评价严重性多形性光敏疹的简单方法

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世界核心医学期刊文摘（皮肤病学分册） 2005年第3期1卷 46-46页

作者： Palmer R.A. vande Pas C.B. Campalani E. 崔荣 Palmer St. John's Institute of Dermatology Division of Skin Sciences St. Thomas'Hospital So uth Wing Block 7 London SE1 7EH United Kingdom Dr.

Background: The severity of polymorphic light eruption (PLE)-is highly vari able. The results of studies of the prevalence, pathogenesis, provocation and tr eatment of PLE may be highly dependent on the severity of disease in the patient s studied. Objectives: To produce a simple, valid and reproducible method to ass ess the severity of PLE, Patients and methods: Eighty patientswere asked about t he PLE they had experienced during the preceding 12 months, using a standardized interview comprising 16 questions. The answer to each question received a score . A PLE Severity Index (PLESI) was formulated, consisting of 10 questions, with a possible total score of 2- 100. The internal consistency of the PLESI (the ex tent to which the responses to different questions correlated with each other) w as assessed by reliability analysis, using Cronbach’s method. Twenty patients were re-interviewed 7- 27 days later to assess the repeatability of the PLESI . The ease of provocation of PLE by exposure at 24- h intervals to solar-simu lated radiation was assessed on a five-point scale in nine of the 80 subjects (the EOPSSR score). Results The value of Cronbach’s α for the PLESI was 0.77 . The distribution of the PLESI was consistent with a normal distribution, with a mean value of 52.7 and standard deviation of 19.4. It had a coefficient of rep eatability of 20.1. The PLESI was positively correlated with EOPSSR (rs = 0.69, P=0.039) and the number of years since onset of PLE (rs=0.25, P=0.03). There was no association between the PLESI and the duration of persistence of the eruptio n after ceasing sun exposure (rs=0.12, P= 0.30), the development of tolerance as summer progressed (rs=- 0.14, P=0.39), gender (P=0.50) or skin type (P=0.87). Conclusions: This study has (i) validated the concept that a single score can re flect disease severity in PLE by showing that the principal characteristics of t he condition, including, for example, the extent of anatomical distribution and the ea

关键词：多形性可重复性常态分布可靠性分析问卷调查 α值发病机制持续时间刺激物评分标准

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