In/Out

At locations where mass flow can enter or leave the network an element with node label 0 at the entry and exit, respectively, has to be specified. Its fluid section type for liquid channel networks must be CHANNEL INOUT, to be specified on the *FLUID SECTION card. For this type there are no extra parameters.

If this type of element is connected to exactly one other element type, the entering mass flow has to be specified in the middle node using a *BOUNDARY card and, if the calculation is thermal, the temperature at the downstream node. If the mass flow is exiting the network nothing should be prescribed. If a In/Out element is connected two elements not of the In/Out type the mass flow always has to be specified, irrespective whether it is entering or leaving the network. Furthermore, for a thermal calculation also the temperature has to be specified as degree of freedom 0 or 11 at the middle node. This is an exception to the rule that temperatures can only be defined in end nodes due to the fact that the external end node of a In/Out element has node number zero. A channel calculation is considered to be thermal if the above temperature rules are satisfied. Furthermore, or thermal channel calculations the definition of absolute zero using a *PHYSICAL CONSTANTS card is mandatory.

Example files: channel14, channeljoint1.