An overview of the physics, concepts, theories, and models underlying the discipline of aerodynamics. This book offers a general overview of the physics, concepts, theories, and models underlying the discipline of aerodynamics. A particular focus is the technique of velocity field representation and modeling via source and vorticity fields and via their sheet, filament, or point-singularity idealizations. These models provide an intuitive feel for aerodynamic flow-field behavior and are the basis of aerodynamic force analysis, drag decomposition, flow interference estimation, and other important applications. The models are applied to both low speed and high speed flows. Viscous flows are also covered, with a focus on understanding boundary layer behavior and its influence on aerodynamic flows. The book covers some topics in depth while offering introductions and summaries of others. Computational methods are indispensable for the practicing aerodynamicist, and the book covers several computational methods in detail, with a focus on vortex lattice and panel methods. The goal is to improve understanding of the physical models that underlie such methods. The book also covers the aerodynamic models that describe the forces and moments on maneuvering aircraft, and provides a good introduction to the concepts and methods used in flight dynamics. It also offers an introduction to unsteady flows and to the subject of wind tunnel measurements. The book is based on the MIT graduate-level course “Flight Vehicle Aerodynamics” and has been developed for use not only in conventional classrooms but also in a massive open online course (or MOOC) offered on the pioneering MOOC platform edX. It will also serve as a valuable reference for professionals in the field. The text assumes that the reader is well versed in basic physics and vector calculus, has had some exposure to basic fluid dynamics and aerodynamics, and is somewhat familiar with aerodynamics and aeronautics terminology.
Collected writings on booze, smoking, society, education, art and various other things on the decline, by the irreverent, provocative and occasionally witty Philadelphia columnist. Excerpts from Mark Randall's Not That You Asked: On smoking: "…it is a shame we are content with this tedious non-debate about which is better, virtue or vice, instead of the really more interesting topic, namely, the relative virtues to be found among the available vices." On identity politics: "…proponents of identity politics are not really offended by racial inferences…they would only prefer that all of the inferences be complimentary." On city living: "Look upon your stolen wreaths as a kind of donation to the poor and you see that what you lose in Hope, you gain in Charity…In fact, since Charity is regarded as the greatest of virtues, you may flatter yourself to be exchanging your Hope at a profit." On religion: "…anti-Papism is one of those activities that's probably best left to Catholics." On the French: "…I have always tried to defend the French against the usual criticisms…but it is difficult work, hampered right at the outset by the fact that most of the usual criticisms are true." On his own problems: "But how do I reconcile a life that fades out with me typing alone in the basement instead of on a terrace in Majorca, on the phone to a producer, occasionally waving down to Francesca who is sunning herself nude on the pier?
At the time of Christ, world politics was an ebb and flow of colliding empires and forces. The world knew only dynastic succession and rule by force. Israel was swept up in this world. Her expectations of deliverance, while diverse, had in common the anticipation of violent liberation by an alliance of God, the expected one (Theo), and Israel's forces. Her vision included the subjugation of the world to Yahweh. Any messianic claimant would be expected to fulfill this hope. Mark's story of Jesus must be read against such expectations of military power. Mark knows that Jesus' plan of salvation differed radically from this. Rather than liberation through revolution, it involved deliverance through humble, loving service and cross-bearing. However, the disciples follow Jesus but do not understand Jesus' purpose. They constantly expect war. So, the Gospel is then read from Mark's full understanding and the disciples' flawed perspective. In this first volume of Jesus in a World of Colliding Empires, Keown backgrounds Mark and the political situations of the world at the time. He then unpacks Mark 1:1--8:29 as Jesus seeks to show the disciples he is Messiah while drawing out the deep irony of their incomprehension.
An overview of the physics, concepts, theories, and models underlying the discipline of aerodynamics. This book offers a general overview of the physics, concepts, theories, and models underlying the discipline of aerodynamics. A particular focus is the technique of velocity field representation and modeling via source and vorticity fields and via their sheet, filament, or point-singularity idealizations. These models provide an intuitive feel for aerodynamic flow-field behavior and are the basis of aerodynamic force analysis, drag decomposition, flow interference estimation, and other important applications. The models are applied to both low speed and high speed flows. Viscous flows are also covered, with a focus on understanding boundary layer behavior and its influence on aerodynamic flows. The book covers some topics in depth while offering introductions and summaries of others. Computational methods are indispensable for the practicing aerodynamicist, and the book covers several computational methods in detail, with a focus on vortex lattice and panel methods. The goal is to improve understanding of the physical models that underlie such methods. The book also covers the aerodynamic models that describe the forces and moments on maneuvering aircraft, and provides a good introduction to the concepts and methods used in flight dynamics. It also offers an introduction to unsteady flows and to the subject of wind tunnel measurements. The book is based on the MIT graduate-level course “Flight Vehicle Aerodynamics” and has been developed for use not only in conventional classrooms but also in a massive open online course (or MOOC) offered on the pioneering MOOC platform edX. It will also serve as a valuable reference for professionals in the field. The text assumes that the reader is well versed in basic physics and vector calculus, has had some exposure to basic fluid dynamics and aerodynamics, and is somewhat familiar with aerodynamics and aeronautics terminology.
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