eel_actuation_model

Module Contents

Classes

EelActuationModel

Compute the mesh at each time step for the eel actuation model given the kinematic variables.

Attributes

num_nodes

class eel_actuation_model.EelActuationModel(**kwargs)

Bases: csdl.Model

Compute the mesh at each time step for the eel actuation model given the kinematic variables. # the geometry and kinematics of the eel # is define from https://www.cse-lab.ethz.ch/wp-content/papercite-data/pdf/kern2006b.pdf

Parameters

surface_nameslist

surface_shapeslist

n_periodint

s_1_indint (num_pts for the head region)

s_2_indint (num_pts for the tail region)

Returns

1. mesh[num_nodes,num_pts_chord, num_pts_span, 3]csdl array

bound vortices points

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,

),

)

```

eel_actuation_model.num_nodes = 20