---

Each of the performance assessment models is an instrument that after implementing it can give the decision makers different information. So it is inevitable to use these models to answer the questions and problems that has been arizen in decision makers’ mind. Therefore, in this article we want to explain the mathematic model of the suitable Data Envelopment Analysis, grading efficiency of instruction groups, the weak and strength points of each group and the situation of optimum use of accessible sources in the human sienceses faculty from the view point of DEA. Since the different models of DEA have been developed during last years to be used in different areas, one of the most important steps before evaluating surveyed units is choosing a model or models suitable with them. This article presents a collection of consecutive steps, in a conceptual framework in order to choose correctly a performance evaluation model. These stages should be performed one after the other, otherwise the credits of evaluation model can scrafeh due to the natural weak nesses of DEA method.

---

Predicting wind flow pattern around high rise building, because of pedestrian comfort, air pollution in weak wind region and etc. has important position in wind engineering. Turbulent wind flow over buildings due to the complexity like sharp corners, ground effect and different vortexes, is one of the best choices to evaluate turbulence methods. Moreover in a campus due to high velocity region between buildings, simulating wind flow is more complex. Therefore reaching acceptable result needs a fine grid with an accurate turbulence model that increases computational cost. DES is hybrid RANS-LES models for simulating turbulent flow which for their characteristic, treat near wall as RANS and farther the wall act as LES model. Consequently in this hybrid model, computational time will decrease compared to traditional LES models. In this article turbulent 3 dimensional wind flow over Tarbiat Modares University with DES method in different wind velocities is simulated. Because cells number is great, parallel processing has been used. For verification, DES results are compared with traditional LES models such as smagorinsky. The results show good agreement with other traditional methods.