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Newtonian and
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Saffman and Wall induced lift forces are applicable for particles traveling through a creeping flow. The Saffman lift force is applicable for particles far from walls. The Wall induced lift force is a specialized formulation to account for the effects of nearby walls as particles move through pipes or channels.
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In 3D models, using the Wall induced lift force can cause a significant increase in computation time, due to the additional overhead of locating the nearest point on a wall for each particle at every time step. This is most noticeable if the boundary mesh is very fine.
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