Solving System of 2 ODEs: Analytical Solution

In summary, to find the solution for this system of two ODEs, you can treat x as a constant and equate the two equations to get a single equation for y as a function of both x and r. This can be solved using the given conditions of x=constant4 at r=constant5 and y=0 at r=constant5.
  • #1
trentar
2
0
hallo I ams earching analytical solution for system of two ODE in next form

x*(dy/dr) - (y*y/r) = constant1*r*r*x*x*x
x*(dy/dr)+(x*y/r)=constant2*r*r*x*x*(r*constant3-y)

where x(r) and y(r). conditions are x=constant4 at r=constant5 and y=0 at r=constant5

thnx

r.
 
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  • #2
(r^2x^3 is simpler than r*r*x*x*x)

Do both equations have "dy/dr"? If neither equation involves dx/dr, you can treat x as a constant. In fact, if we write the two equations as x(dy/dr)= y^2/r+ C1r^2x^3 and x(dy/dr)= -xy/r+ C2r^2x^2(C3- y) and, because the two left sides are equal, equate the two right sides: y^2/r+ C1r^2x^3= -xy/r+ C2r^2x^2(C3- y). You can solve that for y as a function of both x and r and then put that back into the equation to get a single equation for y.
 
  • #3
hallo like this:
x*(dy/dr) - (y*y/r) = constant1*r*r*x*x*x
x*(dx/dr)+(x*y/r)=constant2*r*r*x*x*(r*constant3-y)

where x(r) and y(r). conditions are x=constant4 at r=constant5 and y=0 at r=constant5
 

1. What is a system of 2 ODEs?

A system of 2 ODEs (ordinary differential equations) refers to a set of two equations that involve derivatives of one or more variables. These equations are used to model dynamic systems in various fields such as physics, engineering, and biology.

2. How do you solve a system of 2 ODEs analytically?

To solve a system of 2 ODEs analytically, you need to first rewrite the equations in standard form and then use various techniques such as separation of variables, substitution, or integrating factors to solve for the dependent variables. Once the equations are solved, you can use the initial conditions to find the specific solution.

3. What are the advantages of finding an analytical solution to a system of 2 ODEs?

An analytical solution allows for a precise and exact representation of the system's behavior, which can help in understanding the underlying dynamics and making predictions. It also provides a general solution that can be applied to different initial conditions and parameter values.

4. Are there any limitations to finding an analytical solution for a system of 2 ODEs?

Yes, there are limitations to finding an analytical solution for a system of 2 ODEs. In some cases, the equations may be too complex to solve analytically, and numerical methods may be required. Additionally, the analytical solution may not be applicable to more complex systems that involve non-linear or time-dependent equations.

5. How is finding an analytical solution for a system of 2 ODEs useful in scientific research?

Finding an analytical solution for a system of 2 ODEs is useful in scientific research as it provides a fundamental understanding of the system's behavior and allows for the prediction of its future behavior. It also serves as a starting point for more complex analyses and can aid in the development of numerical methods for solving similar systems.

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