- **Main CFD Forum**
(*http://www.cfd-online.com/Forums/main/*)

- - **Dealing with nonlinear ODE with contraint equations**
(*http://www.cfd-online.com/Forums/main/79462-dealing-nonlinear-ode-contraint-equations.html*)

Dealing with nonlinear ODE with contraint equationsI'd like to solve the below highly nonlinear ODEs with constraint equations. Eq 1 is a 2nd order ODE, so I need two BCs where only one BC is specified and the other should be determined by Eq2. I have no clue on how to approach this kind of problem and don't know how to use Eq 2. I really appreciate that if you could give me some helps to resolve those constraints in terms of numerics. Thanks.
Governing Equations -------------------- nu: 2*(1+nu+nu^2)*nu'*nu'' + (2*nu+1)*(nu')^3 = 0, (Eq 1) Boundary Conditions ------------------- nu(-1) = 0.2, nu(1) = alpha (determined by Eq2) Constraints ------------- N=integral( nu*dY ) dY from Y=-1 to Y=1, (Eq 2) Eq 4 should be used to determine alpha |

N and U appear in the equations but are not mentioned in your description. U' also appears. Something must be missing.
You might try again to specify your problem. |

All times are GMT -4. The time now is 13:51. |