Time-dependent boundary conditions
 

Dear Sir,

I would like to describe time-dependent boundary conditions using some different functions periodically.


pattern 1:
For example, as the boundary condition of U,
0 ~ 5s ... use a function f1(t) as a function of time
5 ~ 10s .... use another function f2(t) as a function of time
10 ~ 15s .... use another function f3(t) as a function of time
15 ~ 20s .... use another function f4(t) as a function of time


pattern 2:
0 ~ 5s ... a face A as inlet (f1(t)), a face B as outlet (zeroGradient)
5 ~ 10s .... a face A as wall (fixedValue(0 0 0)), a face B as outlet (f2(t))
10 ~ 15s .... a face A as outlet (zeroGradient), a face B as inlet (f3(t))
15 ~ 20s .... a face A as outlet (f4(t)), a face B as wall (fixedValue(0 0 0))


Could you teach me how to describe the boundary conditions of above two patterns?


Thank you in advance.

Sincerely,

KeiJun

Hello KeiJun,

You can use of groovyBc utility from swak4Foam package.

With groovyBc you are able to implement any variable boundary condition

with time or position or many other thing.