Example problem 11 has been designed to illustrate the usage of the hydraulic network option. This example couples the hydraulic solution to a transient thermal solution. The necessary input files can be retrieved with the GET_QTRAN command. The problem is simply a fluid flowing in a copper pipe that has a linear variation in heating rate applied along its length. The fluid extracts the heat from the pipe by a convective boundary condition that has a constant heat transfer coefficient. In this case the oil viscosity has been altered to more dramatically illustrate the coupling of the hydraulic and thermal solutions.