def read_txt(self, filePath, overwrite=True, afType=1):
"""
reads in airfoil coordinates file in text format.
Parameters
----------
filePath : path
absolute path of text file to read
overwrite : bool
if True then overwrites coordinates in self.coord otherwise returns coordinates as
numpy array.
afType : integer
type of airfoil file. 1 or 2
"""
if afType == 1:
out = self.read_txt_1(filePath)
if overwrite:
self.coord = out[0]
self.upPts, self.loPts = geom.separate_coordinates(self.coord)
self.name = out[1]
else:
return out[0]
elif afType == 2:
out = self.read_txt_2(filePath)
if overwrite:
self.upPts = out[0]
self.loPts = out[1]
self.join_coordinates()
self.name = out[2]
else:
return geom.join_coordinates(out[0], out[1])
def redim(self, numPts=121, overwrite=False, updCurves=True):
"""
Redimension and redistribution of airfoil points using cosine function.
More points are located at leading and trailing edge.
Parameters
----------
numPts : integer
number of points for target airfoil. If number of points is same
as source airfoil, points will be redistributed to make smooth
surface
overwrite : bool
If True then self.coord, self.upPts and self.loPts will be
overwritten, otherwise will return array of redimensioned points
in format of self.coord
"""
def cos_curve(x):
phi = x * pi
return (cos(phi) + 1.0) / 2.0
if (numPts % 2) == 1:
numPts = int(numPts) / 2 + 1
tUp = linspace(0.0, 1.0, numPts)
tLo = tUp
else:
numPts = int(numPts) / 2 + 1
tUp = linspace(0.0, 1.0, numPts)
tLo = linspace(0.0, 1.0, numPts - 1)
tUp = array([cos_curve(t) for t in tUp])
tLo = array([cos_curve(t) for t in tLo])
if updCurves:
self.create_splines()
xUp, yUp = self.upCurve(tUp)
xLo, yLo = self.loCurve(tLo)
upPts = transpose(vstack([xUp, yUp]))
loPts = transpose(vstack([xLo, yLo]))
coord = geom.join_coordinates(upPts, loPts)
if overwrite:
self.coord = coord
self.upPts = upPts
self.loPts = loPts
else:
return coord
def redim(self,nPts,overwrite=True,distribution='sin'):
"""
Redimension and redistribution of airfoil points using cosine function.
More points are located at leading and trailing edge.
Parameters
----------
numPts : integer
number of points for target airfoil. If number of points is same
as source airfoil, points will be redistributed to make smooth
surface
overwrite : bool
If True then self.pts, self.upPts and self.loPts will be
overwritten, otherwise will return array of redimensioned points
in format of self.pts
"""
if nPts%2==0:
nPts1 = nPts/2
nPts2 = nPts/2+1
else:
nPts1 = (nPts+1)/2
nPts2 = nPts1
#nPts *= 0.5
t1 = self._get_point_distribution(nPts1,distribution)
t2 = self._get_point_distribution(nPts2,distribution)
self._create_splines()
xUp, yUp = self._curveUp(t1)
xLo, yLo = self._curveLo(t2)
upPts = np.transpose(np.vstack([xUp,yUp]))
loPts = np.transpose(np.vstack([xLo,yLo]))
coord = geom.join_coordinates(upPts,loPts)
if overwrite:
self.pts = coord
self.ptsUp = upPts
self.ptsLo = loPts
else:
return coord
def join_coordinates(self):
self.coord = geom.join_coordinates(self.upPts, self.loPts)
def _join_coordinates(self):
self.pts = geom.join_coordinates(self.ptsUp, self.ptsLo)
