[KeiJun]

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

[rapierrz]

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.