Figure 4.

Eddy size for several different models of a filter feeder. Large open circle (white), stokeslet between parallel plates. Asterisks, Brinkman symmetric model; open circles, Brinkman asymmetric model; solid line, Brinkman symmetric model expansion as detailed in the text for a/h → 0. For the Brinkman model, grey symbols correspond to the best fit value β = 0.16 and black to the Hele–Shaw approximation β = 1/12. Filled circles, three-dimensional simulation (§4). Open rectangle (dark grey), experimental observations; error bars show 95% confidence interval.