User:Tohline/VE/RiemannEllipsoids
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(→Equilibrium Expressions) 
(→Equilibrium Expressions) 

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<font color="#007700">is the moment of inertia tensor.</font>  <font color="#007700">is the moment of inertia tensor.</font>  
  ===The  +  ===The Three Diagonal Elements=== 
  +  For <math>~i = j = 1</math>, we have,  
  +  <table border="0" cellpadding="5" align="center">  
+  <tr>  
+  <td align="right">  
+  <math>~0</math>  
+  </td>  
+  <td align="center">  
+  <math>~=</math>  
+  </td>  
+  <td align="left">  
+  <math>~  
+  2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi  
+  + \Omega^2 I_{11}  \Omega_1\Omega_k I_{k1} + 2\epsilon_{1lm}\Omega_m \int_V \rho u_lx_1 dx  
+  </math>  
+  </td>  
+  </tr>  
+  </table>  
  ===The  +  ===The Six OffDiagonal Elements=== 
Notice that the offdiagonal components of both <math>~I_{ij}</math> and <math>~\mathfrak{W}_{ij}</math> are zero. Hence, the equilibrium expression that is dictated by each offdiagonal component of the 2<sup>nd</sup>order TVE is,  Notice that the offdiagonal components of both <math>~I_{ij}</math> and <math>~\mathfrak{W}_{ij}</math> are zero. Hence, the equilibrium expression that is dictated by each offdiagonal component of the 2<sup>nd</sup>order TVE is,  
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</td>  </td>  
</tr>  </tr>  
  
</table>  </table>  
Revision as of 10:41, 4 August 2020
Contents 
SteadyState 2^{nd}Order Tensor Virial Equations
By satisfying all six — not necessarily unique — components of the SecondOrder Tensor Virial Equation, the entire set of Riemann Ellipsoids can be determined.
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Here we are only interested in determining the equilibrium conditions of uniformdensity ellipsoids that have semiaxes, .
General Coefficient Expressions
As has been detailed in an accompanying chapter, the gravitational potential anywhere inside or on the surface, , of an homogeneous ellipsoid may be given analytically in terms of the following three coefficient expressions:









where, and are incomplete elliptic integrals of the first and second kind, respectively, with arguments,

and 

[ EFE, Chapter 3, §17, Eq. (32) ] 
Adopted (Internal) Velocity Field
EFE (p. 130) states that the … kinematical requirement, that the motion , associated with , preserves the ellipsoidal boundary, leads to the following expressions for its components:









[ EFE, Chapter 7, §47, Eq. (1) ] 
Equilibrium Expressions
[EFE §11(b), p. 22] Under conditions of a stationary state, [the tensor virial equation] gives,



[This] provides six integral relations which must obtain whenever the conditions are stationary.
When viewing the (generally ellipsoidal) configuration from a rotating frame of reference, the 2^{nd}order TVE takes on the more general form:



[ EFE, Chapter 2, §12, Eq. (64) ] 
EFE (p. 57) also shows that … The potential energy tensor … for a homogeneous ellipsoid is given by



[ EFE, Chapter 3, §22, Eq. (128) ] 
where



[ EFE, Chapter 3, §22, Eq. (129) ] 
is the moment of inertia tensor.
The Three Diagonal Elements
For , we have,



The Six OffDiagonal Elements
Notice that the offdiagonal components of both and are zero. Hence, the equilibrium expression that is dictated by each offdiagonal component of the 2^{nd}order TVE is,



Various Degrees of Simplification
Riemann SType Ellipsoids
Describe …
Jacobi and Dedekind Ellipsoids
Describe …
Maclaurin Spheroids
Describe …
See Also
© 2014  2020 by Joel E. Tohline 