Computational Fluid Dynamics by J.D. Anderson Jr. (auth.), John F. Wendt (eds.)

By J.D. Anderson Jr. (auth.), John F. Wendt (eds.)

The ebook presents an undemanding instructional presentation on computational fluid dynamics (CFD), emphasizing the basics and surveying a number of resolution innovations whose purposes variety from low pace incompressible move to hypersonic circulate. it's aimed toward people who've very little adventure during this box, either fresh graduates in addition to expert engineers, and should offer an perception to the philosophy and gear of CFD, an realizing of the mathematical nature of the fluid dynamics equations, and a familiarity with a number of resolution concepts. For the 3rd version the textual content has been revised and updated.

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The mass flow of a moving fluid across any fixed surface (say, in kg/s, or slug/s) is equal to the product of (density) × (area of surface) × (component of velocity perpendicular to the surface). 20) ρVn dS = ρV · dS Examining Fig. 4, note that by convention, dS always points in a direction out of the control volume. Hence, when V also points out of the control volume (as shown in Fig. 4), the product ρV · dS is positive. e. it is an outflow. Hence, a positive ρV · dS denotes an outflow. In turn, when V points into the control volume, ρV · dS is negative.

Now, consider the model of a finite control volume fixed in space, as sketched in Fig. 4. At a point on the control surface, the flow velocity is V and the vector elemental surface area (as defined in Sect. 4) is dS . Also let dV be an elemental volume inside the finite control volume. Applied to this control volume, our fundamental physical principle that mass is conserved means 2 Governing Equations of Fluid Dynamics 25 Fig. 19b) or, where B and C are just convenient symbols for the left and right sides, respectively, of Eq.

Why is the use of the conservation form of the equations so important for the shock-capturing method? The answer can be seen by considering the flow across a normal shock wave, as illustrated in Fig. 10. Consider the density distribution across the shock, as sketched in Fig. 10(a). Clearly, there is a discontinuous increase in ρ across the shock. If the non-conservation form of the governing equations were used to calculate this flow, where the primary dependent variables are the primitive variables such as ρ and p, then the equations would see a large discontinuity in the dependent variable ρ.

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