CFD meshing of airfoil and
blade
The meshing of the C-shaped domain of the airfoil starts with global
mesh control by activating advance size function for resolving regions
with curvature for determining the Edge and Face sizes based on
Curvature Normal Angle. In addition to it, local mesh control is also
implemented which contributes mapped face meshing and three edge sizing.
First edge sizing highlights the c portion of the domain with 100 number
of divisions, second edge and third edge sizing consist of 50 division
each with first two bias factor of 150. As illustrated in figure 5, the
outer boundary of the computational domain is C-type with radius 12.5
airfoil chord length for better simulating the wake region downstream of
the airfoil. The base of the domain is 25 airfoil chord length. The mesh
consists of 10251 nodes and 10050 elements. Figure 9 and figure 10 shows
the meshing of C- shape domain and close view of airfoil. By using
identical boundary and computational conditions, the pressure and
velocity distributions were obtained by the software.
For blade, it is meshing start with the same global mesh control
followed by local mesh handling. While controlling global mesh, it is
ascertained that tetrahedral cells get optimized automatically for CFD
and FLUENT. To make the curve with the desired shape and skewness, the
advanced size function is changed to proximity and curvature, with
relevance center maintained at a medium level. To ensure the good
meshing, local mesh inverting these algebraic equations gives the value
of (u, v, w, p, k, and ω) at the cell centers. Here, u, v, and w
indicate the velocity in x, y and z-direction and, k and w reflect
kinetic energy and specific dissipation constant used for turbulence
modeling. Here, the fluid domain is generated automatically as
tetrahedral shaped which is given in figure 7. Moreover, to capture the
boundary layer on an object, the prismatic inflation layer is applied
for external flow and is shown in figure 8. To create more refinement
around the circumference of the blade surface sphere of influence has
been adopted with a radius of 5m and an element size of 2m.