Changes between Version 7 and Version 8 of doc/tec/wtm

Timestamp:

May 24, 2019 10:56:33 AM (6 years ago)

Author:

witha

Comment:

--

doc/tec/wtm

@@ -11 +11 @@
 The PALM-WTM is based on the common actuator disk model (ADM) approach in which the rotor of a wind turbine is represented by a permeable disk that extracts energy from the flow by applying a thrust force at the disk. While in the frequently used simple version of the ADM (e.g. as proposed by [#calaf Calaf et al. (2010)] the forces are uniformly distributed and only the thrust force is considered (thus ignoring the torque), the WTM provides an advanced ADM (ADM-R) that considers varying forces over the rotor disk and rotation of the rotor blades although these are not resolved. The basic concept is similar to the ADM-R proposed by [#wu Wu and Porté-Agel (2011)] with several modifications. The rotor plane is divided into rings and segments such that the segments have an equal size which is a function of the grid spacing.
 
-[[Image(ADM-R_neu.png,150px)]]
+[[Image(ADM-R_neu.png,150px)]]         [[Image(Fig3-BEM-Illustration.png,300px)]]
+
+''Figure 1 (right): Schematic representation of the advanced actuator disk method with the rotor disk segments and the axial (blue arrows) and tangential (red arrows) forces acting on the flow. The grey arrows are representing the tower thrust force.''
+
+''Figure 1 (left): Descriptive illustration of the forces acting on a blade element.''
 
 For each segment the local lift and drag forces ''f'',,l,, and ''f'',,d,, per unit area are calculated: