induced_velocity_comp

Module Contents

Classes

InducedVelocity

Compute various geometric properties for VLM analysis.

Functions

generate_simple_mesh(nx, ny[, n_wake_pts_chord])

class induced_velocity_comp.InducedVelocity(**kwargs)

Bases: csdl.Model

Compute various geometric properties for VLM analysis. These are used primarily to help compute postprocessing quantities, such as wave CD, viscous CD, etc. Some of the quantities, like normals, are used to compute the RHS of the AIC linear system.

Parameters

aic[num_evel_pts_x*num_vortex_panel_x* num_evel_pts_y*num_vortex_panel_y,3]

csdl array

the AIC matrix computed using biot svart’s law

circulations[num_vortex_panel_x*num_vortex_panel_y]csdl array

the circulation strengths of the panels that induces the velocities

Returns

v_induced[num_evel_pts_x, num_evel_pts_y, 3]csdl array

Induced velocities at found along the 3/4 chord.

define()

User defined method to define runtime behavior. Note: the user never _calls_ this method. Only the Simulator class constructor calls this method.

Example

```py class Example(Model):

def define(self):

self.create_input(‘x’) m = 5 b = 3 y = m*x + b self.register_output(‘y’, y)

# compile using Simulator imported from back end… sim = Simulator(Example()) sim[‘x’] = -3/5 sim.run() print(sim[‘y’]) # expect 0 ```

initialize()

User defined method to declare parameter values. Parameters are compile time constants (neither inputs nor outputs to the model) and cannot be updated at runtime. Parameters are intended to make a Model subclass definition generic, and therefore reusable. The example below shows how a Model subclass definition uses parameters and how the user can set parameters when constructing the example Model subclass.

Example

```py class Example(Model):

def initialize(self):

self.parameters.declare(‘num_times’, types=int) self.parameters.declare(‘step_size’, types=float) self.parameters.declare(‘surface’, types=dict)

def define(self):

num_times = self.parameters[‘num_times’] step_size = self.parameters[‘step_size’] surface = self.parameters[‘surface’] name = surface[‘name’] # str symmetry = surface[‘symmetry’] # bool mesh = surface[‘mesh’] # numpy array

# define runtime behavior…

surface = {

‘name’: ‘wing’, ‘symmetry’: False, ‘mesh’: mesh,

}

# compile using Simulator imported from back end… sim = Simulator(

Example(

num_times=100, step_size=0.1, surface=surface,

),

)

```

induced_velocity_comp.generate_simple_mesh(nx, ny, n_wake_pts_chord=None)