2528df0f75
These changes make it unnecessary to copy header files around during the build process, which tends to confuse IDEs and debuggers. The headers which comprise Cantera's external C++ interface are now in the 'include' directory. All of the samples and demos are now in the 'samples' subdirectory.
63 lines
1.5 KiB
Fortran
63 lines
1.5 KiB
Fortran
c
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c Mach number vs. area for an isentropic flow. See also the Python
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c version of this problem in the Python demos.
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c
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program isentropic
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implicit double precision (a-h,o-z)
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parameter (oneatm = 1.01325d5, NPTS = 200)
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double precision a(NPTS), dmach(NPTS), t(NPTS),
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$ ratio(NPTS)
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call newIdealGasMix('gri30.cti','gri30','')
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temp = 1200.d0
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pres = 10.d0*oneatm
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call setState_TPX_String(temp, pres,'H2:1, N2:0.1')
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c stagnation state properties
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s0 = entropy_mass()
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h0 = enthalpy_mass()
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p0 = pressure()
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dmdot = 1.0d0
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amin = 1.0d14
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do n = 1, NPTS
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p = p0*n/(NPTS+1)
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call setState_SP(s0,p)
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h = enthalpy_mass()
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rho = density()
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v2 = 2.0*(h0 - h)
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v = sqrt(v2)
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area = dmdot/(rho*v)
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if (area .lt. amin) then
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amin = area
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end if
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a(n) = area
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dmach(n) = v/soundspeed()
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t(n) = temperature()
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ratio(n) = p/p0
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end do
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do n = 1, NPTS
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a(n) = a(n)/amin
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write(*,30) a(n), dmach(n), t(n), ratio(n)
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30 format(4e16.5)
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end do
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stop
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end
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double precision function soundspeed()
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implicit double precision (a-h,o-z)
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double precision meanMolarMass
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parameter (R = 8314.3d0)
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gamma = cp_mass()/cv_mass()
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soundspeed = sqrt(gamma * R * temperature()
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$ / meanMolarMass())
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return
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end
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