StepUvlm
- class sharpy.solvers.stepuvlm.StepUvlm[source]
StepUVLM is the main solver to use for unsteady aerodynamics.
The desired flow field is injected into the simulation by means of a
generator
. For a list of available velocity field generators see the documentation page on generators which can be found under SHARPy Source Code.Typical generators could be:
TurbVelocityField
amongst others.
The settings that this solver accepts are given by a dictionary, with the following key-value pairs:
Name
Type
Description
Default
Options
print_info
bool
Print info to screen
True
num_cores
int
Number of cores to use in the VLM lib
0
n_time_steps
int
Number of time steps to be run
100
convection_scheme
int
0
: fixed wake,2
: convected with background flow;``3``: full force-free wake3
0
,2
,3
dt
float
Time step
0.1
iterative_solver
bool
Not in use
False
iterative_tol
float
Not in use
0.0001
iterative_precond
bool
Not in use
False
velocity_field_generator
str
Name of the velocity field generator to be used in the simulation
SteadyVelocityField
velocity_field_input
dict
Dictionary of settings for the velocity field generator
{}
gamma_dot_filtering
int
Filtering parameter for the Welch filter for the Gamma_dot estimation. Used when
unsteady_force_contribution
ison
.0
rho
float
Air density
1.225
cfl1
bool
If it is
True
, it assumes that the discretisation complies with CFL=1True
vortex_radius
float
Distance between points below which induction is not computed
sharpy.utils.constants.vortex_radius_def
vortex_radius_wake_ind
float
Distance between points below which induction is not computed in the wake convection
sharpy.utils.constants.vortex_radius_def
interp_coords
int
Coordinates to use for wake description: cartesian(0) or cylindrical_z(1)
0
0
,1
filter_method
int
Method to filter the points: no filter (0) moving average(2)
0
0
,2
interp_method
int
Method of interpolation: linear(0), parabolic(1), splines(2), slerp around z(3), slerp around yaw_slerp(4)
0
0
,1
,2
,3
,4
yaw_slerp
float
Yaw angle in radians to be used when interp_metod == 4
0
centre_rot
list(float)
Coordinates of the centre of rotation to perform slerp interpolation or cylindrical coordinates
[0.0, 0.0, 0.0]
quasi_steady
bool
Use quasi-steady approximation in UVLM
False
only_nonlifting
bool
Consider nonlifting body interactions
False
nonlifting_body_interactions
bool
Consider nonlifting body interactions
False
phantom_wing_test
bool
Debug option
False
centre_rot_g
list(float)
Centre of rotation in G FoR around which
rbm_vel_g
is applied[0.0, 0.0, 0.0]
ignore_first_x_nodes_in_force_calculation
int
Ignores the forces on the first user-specified number of nodes of all surfaces.
0