An Aerodynamic Panel Method implemented in Python for use from Python scripts. Examples in the "./scripts" folder.
JSON Definition File:
{
"name": "Prandtl-D2",
"mach": 0.0,
"sref": 0.94064328,
"cref": 0.2686,
"bref": 3.749,
"xref": 0.3270,
"yref": 0.0,
"zref": 0.0,
"surfaces": [
{
"name": "Wing",
"twist": 0.0,
"mirror": true,
"cnum": 16,
"sections": [
{
"xpos": 0.0,
"ypos": 0.0,
"zpos": 0.0,
"chord": 0.40005,
"bnum": 50,
"bspc": "full-cosine",
"airfoil": "prandtl_root.dat",
"xoc": 0.0,
"zoc": 0.0
},
{
"xpos": 0.83459,
"ypos": 1.87452,
"zpos": 0.08177,
"chord": 0.10008,
"airfoil": "prandtl_tip.dat",
"xoc": 0.0,
"zoc": 0.0
}
],
"functions": [
{
"variable": "twist",
"spacing": "equal",
"interp": "cubic",
"values": [
8.3274,
8.5524,
8.7259,
8.8441,
8.9030,
8.8984,
8.8257,
8.6801,
8.4565,
8.1492,
7.7522,
7.2592,
6.6634,
5.9579,
5.1362,
4.1927,
3.1253,
1.9394,
0.6589,
-0.6417,
-1.6726
]
}
]
}
],
"cases": [
{
"name": "Design Point",
"alpha": 0.0,
"speed": 13.0,
"density": 1.145
}
]
}
Typical Python Script File "test_prandtl-d2.py":
#%%
# Import Dependencies
from IPython.display import display_markdown
from pyapm.classes import PanelResult, panelsystem_from_json
from pyapm.output.msh import panelresult_to_msh
#%%
# Create Panel Mesh
jsonfilepath = r'../files/Prandtl-D2.json'
psys = panelsystem_from_json(jsonfilepath)
psys.assemble_panels()
psys.assemble_horseshoes()
psys.solve_system()
#%%
# Solve Panel Result
alpha = 0.0
speed = 13.0
rho = 1.145
pres = PanelResult('Design Point', psys)
pres.set_density(rho=rho)
pres.set_state(alpha=alpha, speed=speed)
display_markdown(pres)
display_markdown(pres.surface_loads)
mshfilepath = '../results/' + psys.name + '.msh'
panelresult_to_msh(pres, mshfilepath)Mesh File Output:
You can generate a Gmsh mesh file (*.msh) directly from a Python script using the following code snippet.
mshfilepath = '../results/' + psys.name + '.msh'
panelresult_to_msh(pres, mshfilepath)This will output a mesh file to the specified location, which can then be viewed in Gmsh. The latest version of Gmsh can be downloaded at:
Use File > Open in Gmsh to open the mesh file with the pressure results.
A sample of the aircraft shown in Gmsh is captured below. Consult Gmsh help to operate Gmsh.
