.. _sphx_glr_api_gallery_fluid_engineering_drag:

Drag
----

The drag on a sphere, from creeping flow to the drag crisis.


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  <div id='sg-tag-list' class='sphx-glr-tag-list'></div>


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    <div class="sphx-glr-thumbnails">

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    <div class="sphx-glr-thumbcontainer" tooltip="George Gabriel Stokes, correcting pendulum experiments for the air dragged along with the bob, solved the slow viscous flow past a sphere in a paper read to the Cambridge Philosophical Society in December 1850 and printed in 1851. The drag is 3\pi\mu dV (~engineeringkit.fluid_engineering.stokes_drag), so a small sphere settles at (\rho_p - \rho)gd^2/(18\mu) (~engineeringkit.fluid_engineering.stokes_settling_velocity). The law fails once inertia matters, near Re = 1; the measured drag curve (~engineeringkit.fluid_engineering.sphere_drag_coefficient) takes over. This example draws the curve and finds how fast sand grains of different sizes fall through water (~engineeringkit.fluid_engineering.terminal_velocity).">

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  .. image:: /api/gallery/fluid_engineering/drag/images/thumb/sphx_glr_plot_01_stokes_drag_thumb.png
    :alt:

  :doc:`/api/gallery/fluid_engineering/drag/plot_01_stokes_drag`

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      <div class="sphx-glr-thumbnail-title">Stokes's drag on a sphere (1851)</div>
    </div>


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    </div>


.. toctree::
   :hidden:

   /api/gallery/fluid_engineering/drag/plot_01_stokes_drag