BET Disk

Contents

BET Disk#

This script demonstrates the setup and execution of a simulation involving a Blade Element Theory (BET) disk using the Flow360 Python API. It covers loading geometry, defining mesh refinements including axisymmetric refinement for the rotor region, specifying operating conditions using AerospaceCondition.from_mach(), creating a BET disk from an external xrotor file and additional input parameters, as well as submitting the case through the Project interface.

  1import flow360 as fl
  2from flow360.examples import TutorialBETDisk
  3
  4TutorialBETDisk.get_files()
  5
  6project = fl.Project.from_geometry(TutorialBETDisk.geometry, name="Tutorial BETDisk from Python")
  7geometry = project.geometry
  8
  9# show face and edge groupings
 10geometry.show_available_groupings(verbose_mode=True)
 11geometry.group_faces_by_tag("faceName")
 12geometry.group_edges_by_tag("edgeName")
 13
 14
 15with fl.SI_unit_system:
 16    cylinder1 = fl.Cylinder(
 17        name="cylinder1",
 18        axis=[1, 0, 0],
 19        center=[-2.0, 5.0, 0],
 20        outer_radius=4.0,
 21        height=0.6,
 22    )
 23    cylinder2 = fl.Cylinder(
 24        name="cylinder2",
 25        axis=[1, 0, 0],
 26        center=[0, 5, 0],
 27        outer_radius=4.1,
 28        height=5,
 29    )
 30    bet_cylinder = fl.Cylinder(
 31        name="bet_cylinder",
 32        axis=[-1, 0, 0],
 33        center=[-2.0, 5.0, 0.0],
 34        outer_radius=3.81,
 35        height=0.4572,
 36    )
 37    farfield = fl.AutomatedFarfield()
 38    params = fl.SimulationParams(
 39        meshing=fl.MeshingParams(
 40            defaults=fl.MeshingDefaults(
 41                surface_edge_growth_rate=1.2,
 42                surface_max_edge_length=0.5,
 43                curvature_resolution_angle=30 * fl.u.deg,
 44                boundary_layer_growth_rate=1.15,
 45                boundary_layer_first_layer_thickness=1e-06,
 46            ),
 47            volume_zones=[farfield],
 48            refinements=[
 49                fl.AxisymmetricRefinement(
 50                    name="BET_Disk",
 51                    spacing_axial=0.02,
 52                    spacing_radial=0.03,
 53                    spacing_circumferential=0.06,
 54                    entities=cylinder1,
 55                ),
 56                fl.UniformRefinement(name="cylinder_refinement", spacing=0.1, entities=[cylinder2]),
 57                fl.SurfaceRefinement(
 58                    name="tip",
 59                    max_edge_length=0.01,
 60                    faces=[
 61                        geometry["tip"],
 62                    ],
 63                ),
 64                fl.SurfaceEdgeRefinement(
 65                    name="aniso",
 66                    method=fl.HeightBasedRefinement(value=0.0003),
 67                    edges=[
 68                        geometry["wingTrailingEdge"],
 69                        geometry["wingLeadingEdge"],
 70                    ],
 71                ),
 72                fl.SurfaceEdgeRefinement(
 73                    name="projectAnisoSpacing",
 74                    method=fl.ProjectAnisoSpacing(),
 75                    edges=[
 76                        geometry["rootAirfoilEdge"],
 77                        geometry["tipAirfoilEdge"],
 78                    ],
 79                ),
 80            ],
 81        ),
 82        reference_geometry=fl.ReferenceGeometry(
 83            moment_center=[0.375, 0, 0],
 84            moment_length=[1.26666666, 1.26666666, 1.26666666],
 85            area=12.5,
 86        ),
 87        operating_condition=fl.AerospaceCondition.from_mach(
 88            mach=0.182,
 89            alpha=5 * fl.u.deg,
 90            reference_mach=0.54,
 91        ),
 92        time_stepping=fl.Steady(
 93            max_steps=10000, CFL=fl.RampCFL(initial=1, final=100, ramp_steps=2000)
 94        ),
 95        outputs=[
 96            fl.VolumeOutput(
 97                output_fields=[
 98                    "primitiveVars",
 99                    "betMetrics",
100                    "qcriterion",
101                ],
102            ),
103            fl.SurfaceOutput(
104                surfaces=geometry["*"],
105                output_fields=[
106                    "primitiveVars",
107                    "Cp",
108                    "Cf",
109                    "CfVec",
110                ],
111            ),
112        ],
113        models=[
114            fl.Wall(
115                surfaces=[
116                    geometry["wing"],
117                    geometry["tip"],
118                ],
119            ),
120            fl.Freestream(surfaces=farfield.farfield),
121            fl.SlipWall(surfaces=farfield.symmetry_planes),
122            fl.Fluid(
123                navier_stokes_solver=fl.NavierStokesSolver(
124                    absolute_tolerance=1e-12,
125                ),
126                turbulence_model_solver=fl.SpalartAllmaras(
127                    absolute_tolerance=1e-10,
128                    update_jacobian_frequency=1,
129                    equation_evaluation_frequency=1,
130                ),
131            ),
132            fl.BETDisk.from_xrotor(
133                file=fl.XROTORFile(file_path=TutorialBETDisk.extra["xrotor"]),
134                rotation_direction_rule="rightHand",
135                omega=460 * fl.u.rpm,
136                chord_ref=0.3556,
137                n_loading_nodes=20,
138                entities=bet_cylinder,
139                angle_unit=fl.u.deg,
140                length_unit=fl.u.m,
141            ),
142        ],
143    )
144
145
146project.run_case(params=params, name="Case of tutorial BETDisk from Python")

Notes#

  • BET disk parameters such as sectional polars and geometric definitions are loaded from an external xrotor file while others are user defined.

  • AxisymmetricRefinement is utilized to control mesh resolution specifically within the cylindrical region encompassing the BET disk.

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