数学建模社区-数学中国
标题: 空气动力学三大方程 [打印本页]
作者: 杨利霞 时间: 2019-4-21 11:19
标题: 空气动力学三大方程
空气动力学三大方程
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* z1 \4 u$ e1 r2 \5 Y" l[color=rgba(0, 0, 0, 0.74902)]这里写自定义目录标题& h3 f# y. R* E4 M+ P
5 M7 ?& M: u# {9 b( M/ w5 zthese equations, as follows:
- Invoke three fundamental physical principles that are deeply entrenched in our macroscopic observations of nature, namely,
$ M/ M! X: ^) d# f6 O ]$ Ea. Mass is conserved (i.e., mass can be neither created nor destroyed).
, \& w! h5 `; K, ?b. Newton’s second law: force = mass × acceleration.
9 w$ X/ H( y5 T$ g* y" ?c. Energy is conserved; it can only change from one form to another. - Determine a suitable model of the fluid. Remember that a fluid is a squishy substance, and therefore it is usually more difficult to describe than a well-defined solid body. Hence, we have to adopt a reasonable model of the fluid to which we can apply the fundamental principles stated in item 1.
- Apply the fundamental physical principles listed in item 1 to the model of the fluid determined in item 2 in order to obtain mathematical equations which properly describe the physics of the flow. In turn, use these fundamental equations to analyze any particular aerodynamic flow problem of interest.
4 ^ z) Q' \0 V, z- @/ C7 S+ S3 S* }这些方程如下:( z7 F( P8 Y0 S8 q
1.引用我们对自然的宏观观察中根深蒂固的三个基本物理原则,即
2 p3 u/ j A" h, h5 h1.质量是守恒的(即既不能产生质量也不能破坏质量)。
# m1 W. A$ Z5 F- t& L2.牛顿第二定律:力=质量×加速度。
3 F4 E2 ~ U# t a: B, K) Y+ t3.节约能源; 它只能从一种形式变为另一种形式。, H- @, R; ^# y
2.确定合适的流体模型。 请记住,流体是一种柔软的物质,因此通常比明确定义的固体更难描述。 因此,我们必须采用合理的流体模型,我们可以应用第1项所述的基本原则。
% o& }, I# M) o" h7 I' E& |1 a3.将第1项中列出的基本物理原理应用于第2项中确定的流体模型,以获得正确描述流动物理学的数学方程。 反过来,使用这些基本方程来分析任何感兴趣的特定空气动力学流动问题。
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网络挑战赛个人赛优秀论文集完结版.zip
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作者: 3477959497 时间: 2019-4-22 10:50
不错。。。。。。。。。。。。。' f/ x0 f9 t+ V' z
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