# Streamline Output

An output type allowing for streamline visualisation. The streamlines are a useful tool for visualising 3D flow structures.

# Available Options

Option Description
Assigned points Points indicating the locations of streamlines

# Detailed Descriptions

# Assigned points

Points that define the placement of streamlines. The Streamline is a path of a particle that passes through a given point.

  • Point Definition: The creation of points is described in detail here

Notes:

  • You can specify individual points or arrays of points to seed streamlines at multiple locations.
  • Points can be defined in the GUI or via the Python API.

💡 Tips
  • Use streamlines to visualize flow direction and identify recirculation zones, vortices, and wake structures.
  • Place points in regions of interest, such as near surfaces, in wakes, or around obstacles.
  • For best results, use a consistent color map for streamline visualization across different cases.
  • Combine streamline output with other outputs (e.g., volume or surface fields) for comprehensive flow analysis.

❓ Frequently Asked Questions

  • How do I choose where to place streamline points?

    Place points in regions where you expect interesting flow features, such as near separation points, in the wakes or in front of flow control devices.

  • What variables are used for streamline calculation?

    Streamlines are calculated using the velocity field.

🐍 Python Example Usage

 
from flow360 import StreamlineOutput

# Example of configuring streamline output using Flow360 Python API
streamline_output = StreamlineOutput(
    entities=[
        fl.Point(
            name="Point_1",
            location=(0.0, 1.5, 0.0) * fl.u.m,
        ),
        fl.Point(
            name="Point_2",
            location=(0.0, -1.5, 0.0) * fl.u.m,
        ),
        fl.PointArray(
            name="Line_streamline",
            start=(1.0, 0.0, 0.0) * fl.u.m,
            end=(1.0, 0.0, -10.0) * fl.u.m,
            number_of_points=11,
        ),
        fl.PointArray2D(
            name="Parallelogram_streamline",
            origin=(1.0, 0.0, 0.0) * fl.u.m,
            u_axis_vector=(0, 2.0, 2.0) * fl.u.m,
            v_axis_vector=(0, 1.0, 0) * fl.u.m,
            u_number_of_points=11,
            v_number_of_points=20
        )
    ]
)

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