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Abu Tāher Tarsusi is one of the literate and eloquent narrators in Persian literature that has been known by two published narratives called, Darabnameh and Abu Moslemnameh. A theory has been given already about his historical identity and assignment to the court of Sultan Mahmud of Ghazni. For the first time, this research has attempted to propose other possibilities during the first theory by newfound documents that obtained from the other Tarsusi’s narrative, called Qeran Habashi. This paper analyzed in three parts of great Shahnameh, Gitinama Minar and twofold sources along stating some reasons and the results of this research indicate the Abu Tāher presence between the ends of the Ghaznavid dynasty to the middle of the Ghurid reign. Based on this article evidences, Qeran Habashi was the last Tarsusi’s work and its hero is another desired and idealized figure of sahib Qeran Sultan deeds, Ghiyāth al-Dīn Mohammad Ghurid, that her mother called him, Habashi.

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Demands for high speed vessels are increasing due to various usages. Reducing the resistance to achieve high speeds is an important objective in design of high speed crafts. Creating longitudinal side tunnels in the hull causes resistance reduction. Designing the boat is not right only for reducing drag force; stability and maneuverability are also important factors. In this paper, high speed tunneled hull performance is evaluated considering numerical simulation of turning circle maneuver as a standard maneuver. The numerical approach is implemented due to high and acceptable accuracy compared with mathematical models and lower cost compared to experimental tests. Among the various techniques, modeling of maneuver of the boat was performed by considering mesh movement with boat and combination of sliding mesh and movement of domain as an effective method. Reducing computation time and increasing the accuracy of solution is of its advantages. Finite volume method and k-ω model is used respectively for discretization equations and simulation of turbulence. In free surface modeling, mixture model was preferred instead of free surface model. Solution methodology was validated using experimental results of a single-hull boat. Path of the boat in various tests was presented in the result section, considering the effect of angle of rudder, thrust and movement mode of the boat on the maneuver parameters. The results show enhancing maneuverability of the boat by approaching the planing mode so that by increasing the speed and closing to planing mode, tactical diameter is reduced up to 7.5% compared to the displacement mode.