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Fix for Mach number; Y coordinate outputting #20

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Jun 16, 2021
Merged

Fix for Mach number; Y coordinate outputting #20

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1f807ba
Mach number fix
gduthe May 14, 2021
21952d5
Y coordinate output
gduthe May 14, 2021
ce182a0
y-out definition
May 14, 2021
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6 changes: 4 additions & 2 deletions src/api.f90
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Original file line number Diff line number Diff line change
Expand Up @@ -203,6 +203,7 @@ subroutine set_mach(M) bind(c, name='set_mach')

if (M /= MINf) then
MINf = M
MINf1 = M

call comset
if (MINf>0.0 .and. show_output) write (*, 99003) CPStar, QSTar / QINf
Expand Down Expand Up @@ -486,14 +487,14 @@ function get_n_cp() bind(c, name='get_n_cp')
get_n_cp = N
end function get_n_cp

subroutine get_cp(x_out, cp_out, n_points) bind(c, name='get_cp')
subroutine get_cp(x_out, y_out, cp_out, n_points) bind(c, name='get_cp')
use s_xfoil, only: comset
use m_xoper
use i_xfoil
implicit none

integer(c_int), intent(in) :: n_points
real(c_float), dimension(n_points), intent(inout) :: x_out, cp_out
real(c_float), dimension(n_points), intent(inout) :: x_out, y_out, cp_out

real :: beta, bfac, cpcom, cpinc, den
integer :: i
Expand All @@ -507,6 +508,7 @@ subroutine get_cp(x_out, cp_out, n_points) bind(c, name='get_cp')
den = beta + bfac * cpinc
cp_out(i) = cpinc / den
x_out(i) = X(i)
y_out(i) = Y(i)
enddo
end subroutine get_cp

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7 changes: 5 additions & 2 deletions xfoil/xfoil.py
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Expand Up @@ -321,12 +321,15 @@ def get_cp_distribution(self):
-------
x : np.array
X-coordinates
y : np.array
Y-coordinates
cp : np.ndarray
Pressure coefficients at the corresponding x-coordinates
"""
n = self._lib.get_n_cp()
x = np.zeros(n, dtype=c_float)
y = np.zeros(n, dtype=c_float)
cp = np.zeros(n, dtype=c_float)

self._lib.get_cp(x.ctypes.data_as(fptr), cp.ctypes.data_as(fptr), byref(c_int(n)))
return x.astype(float), cp.astype(float)
self._lib.get_cp(x.ctypes.data_as(fptr), y.ctypes.data_as(fptr), cp.ctypes.data_as(fptr), byref(c_int(n)))
return x.astype(float), y.astype(float), cp.astype(float)