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Solve a cubic equation for initial conditions

Posted 2022年8月2日 GMT-4 03:58 General, Studies & Solvers, Modeling Workflow Version 6.0 1 Reply

Richard Mcnair
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Hi,

I need to find my initial conditions before I solve my equation. The initial conditions at every point in the grid is found by solving a cubic equation where the coefficients are functions of the spatial coordinates and other known parameters. Is there a way of doing this in COMSOL? Can someone explain this to me clearly and simply?

Thanks in advance. Richard

1 Reply Last Post 2022年8月2日 GMT-4 13:52
Jeff Hiller COMSOL Employee

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Posted: 2 years ago 2022年8月2日 GMT-4 13:52
Updated: 2 years ago 2022年8月3日 GMT-4 09:33

Hello Richard,

Yes, you can do this in COMSOL. I am attaching to this post a toy model that solves the equation using the "Domain ODEs and DAEs" interface and then uses the solution of that equation as the initial temperature for a transient thermal conduction problem. Note the use of two study steps in the Study branch, each used to solve one equation.

Best,

Jeff

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Jeff Hiller
Hello Richard, Yes, you can do this in COMSOL. I am attaching to this post a toy model that solves the equation (1+x+y)*u^3=5 using the "Domain ODEs and DAEs" interface and then uses the solution of that equation as the initial temperature for a transient thermal conduction problem. Note the use of two study steps in the Study branch, each used to solve one equation. Best, Jeff

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