Straight Channel

Figure 120: Channel geometry

The straight channel is characterized by a trapezoidal cross section with constant width $b$ and trapezoidal angle $\theta$. This is illustrated in Figure 120. The following constants have to be specified on the line beneath the *FLUID SECTION,TYPE=CHANNEL STRAIGHT card:

• the width $b$
• the trapezoid angle $\theta$
• the length $L$ (if $L \le 0$ the length is calculated from the coordinates of the end nodes belonging to the element)
• the slope $S_0= \sin \phi$ (if $S_0<-1$ the slope is calculated from the coordinates of the end nodes belonging to the element)
• the grain diameter $k_s$ for the White-Colebrook law or the Manning constant $n$ for the Manning law (in the latter case the user has to specify the parameter MANNING on the *FLUID SECTION card)

Example files: channel1, chanson1.