[nandiganavishal]

Dear Foamers,

I would like to know if there is any command to to get the maximum
value of a dependent variable in the domain.

For instance, if I am solving dc/dt = d^2c/dx^2 in a rectangular domain, is it
possible to print the maximum value of "c" in the domain at every
time. However, I do nott know where the maximum occurs in the domain apriori. Kindly let
me know !!

Thanks

Vishal

[niaz]

Dear nandi
just add like this to your solver
Info<< "max-min rho: " << max(rho).value()

[nandiganavishal]

Hi Niaz

Thanks for the reply. It works

Vishal

[nandiganavishal]

Hi,

I would like to know if we can change the timestep in the code during the runtime without manually tweeking it.

Thanks

Vishal

[niaz]

Originally Posted by nandiganavishal

Hi,

I would like to know if we can change the timestep in the code during the runtime without manually tweeking it.

Thanks

Vishal

Some of solvers can do it based on corrunt number
just use adjustableRunTime and keep maxCo on your desirable amount.

[nandiganavishal]

Thanks for the reply.

The final query I have is with respect to implementing one of the boundary conditions on the walls of the domain.

I have a rectangular domain and on one of the lateral walls of the domain I want to implement the following boundary condition for the velocity
u = 0
dv/dx = 0
where u is the normal velocity and v is the tangential velocity. How can we implement both these conditions on the wall.

Kindly let me know

Vishal

[adhiraj]

Isn't it the boundary condition "slip"?

[nandiganavishal]

It is not essentially a slip boundary condition, u = 0 is a slip boundary condition but dv/dx = 0 indicates a free stress boundary condition on the lateral walls.

[nandiganavishal]

Dear adhiraj

Ignore my previous post. It is the slip boundary condition I needed in openfoam.

Thanks

Vishal