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General Form PDE
Posted 31 ago 2011, 12:44 GMT-4 Version 4.2 1 Reply
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Hi
Is it possible to solve the following PDE ?
a*[d^2/dt^2(u)]+b*[d^4/dx^4(u)]=f(x,t) where 'a' and 'b' are constants and u=u(x,t)
By using the general form PDE
I cant define the 4th derivative in the Conservative Flux
Is there any other way ?
Thank you
Is it possible to solve the following PDE ?
a*[d^2/dt^2(u)]+b*[d^4/dx^4(u)]=f(x,t) where 'a' and 'b' are constants and u=u(x,t)
By using the general form PDE
I cant define the 4th derivative in the Conservative Flux
Is there any other way ?
Thank you
1 Reply Last Post 31 ago 2011, 12:55 GMT-4
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Posted:
1 decade ago
Hi
what about defining a new dependent variable that is the second derivative, and then derive it twice. You add a dependent variable, but you end up with only 2nd order equations + some BC's
This is a general math approach to resolve higher order PDE's all reasons to apply it with COMSOL too ;)
--
Good luck
Ivar
what about defining a new dependent variable that is the second derivative, and then derive it twice. You add a dependent variable, but you end up with only 2nd order equations + some BC's
This is a general math approach to resolve higher order PDE's all reasons to apply it with COMSOL too ;)
--
Good luck
Ivar