I want to analyse the flow through a valve. To do this, how
much length of a pipe should be taken across the valve to apply the
boundary conditions? Is there any thumb rule for this?
I guess it all depends. As a rule of thumb, you should model
any geometry that you believe will affect the flow.
If there is no significant geometry changes before the valve inlet,
you can specify a fully developed flow at the inlet.
Usually where it makes the most difference is the valve OUTLET.
Make sure you add enough geometry after the valve to account for
this.
If there is no significant geometry changes before the valve inlet, you can specify a fully developed flow at the inlet.
Usually where it makes the most difference is the valve OUTLET. Make sure you add enough geometry after the valve to account for this.