DOI: 10.5061/dryad.94jn4t9
title: Data from: Hydrodynamic performance of suction feeding is virtually unaffected by variation in the shape of the posterior region of the pharynx in fish

description: To capture prey by suction, fish generate a flow of water that enters the
 mouth, and exits at the back of the head. It was previously hypothesized
 prey-capture performance is improved by a streamlined shape of the
 posterior region of the pharynx, which enables an unobstructed outflow
 with minimal hydrodynamic resistance. However, this hypothesis remained
 untested for several decades. Using computational fluid dynamics
 simulations, we now managed to quantify the effects of different shapes of
 the posterior pharynx on the dynamics of suction feeding, based on a
 feeding act of a sunfish (Lepomis gibbosus). In contrast to what was
 hypothesized, the effects of the imposed variation in shape were
 negligible: flow velocity patterns remained essentially identical, and the
 effects on feeding dynamics were negligibly small. This remarkable
 hydrodynamic insensitivity implies that, in course of the evolution, the
 observed wedge-like protrusions of the pectoral surfaces of the pharynx
 probably resulted from spatial constraints and/or mechanical demands on
 the musculoskeletal linkages, rather than constraints imposed by
 hydrodynamics. Our study therefore exceptionally shows that a streamlined
 biological shape subjected to fluid flows is not always the result of
 selection for hydrodynamic improvement.
description: CFD models b1 to
 b4Ansys 19.0 Workbench
 project file that contains the model and data for the simulation described
 in the article as "model b1", "model b2", "model
 b3", "model b4". Individual data files from three time
 steps (8 ms, 20 ms, and 200 ms), and user-defined function input source
 files can be found under /dp0/FFF-17/Fluent, /dp0/FFF-22/Fluent,
 /dp0/FFF-23/Fluent, /dp0/FFF-24/Fluent. Zip file, 0.49
 GB.suction_model_PP&SVW2018_b1_b_b3_b4.zipCFD model a1 PART1/7Ansys 19.0 Workbench project file that contains the model and data for the simulation described in the article as "model a1".Individual data files from time steps, and user-defined function input source files can be found under /dp0/FFF-9/Fluent and /dp0/FFF-10/Fluent. Zip file, 6.36 GB.suction_model_PP&SVW2018_a1.zip.001CFD model a1 PART2/7suction_model_PP&SVW2018_a1.zip.002CFD model a1 PART3/7suction_model_PP&SVW2018_a1.zip.003CFD model a1 PART4/7suction_model_PP&SVW2018_a1.zip.004CFD model a1 PART5/7suction_model_PP&SVW2018_a1.zip.005CFD model a1 PART6/7suction_model_PP&SVW2018_a1.zip.006CFD model a1 PART7/7suction_model_PP&SVW2018_a1.zip.007CFD model a2 PART1/7Ansys 19.0 Workbench project file that contains the model and data for the simulation described in the article as "model a2".Individual data files from time steps, and user-defined function input source files can be found under /dp0/FFF-14/Fluent and /dp0/FFF-15/Fluent. Zip file, 6.63 GB.suction_model_PP&SVW2018_a2.zip.001CFD model a2 PART2/7suction_model_PP&SVW2018_a2.zip.002CFD model a2 PART3/7suction_model_PP&SVW2018_a2.zip.003CFD model a2 PART4/7suction_model_PP&SVW2018_a2.zip.004CFD model a2 PART5/7suction_model_PP&SVW2018_a2.zip.005CFD model a2 PART6/7suction_model_PP&SVW2018_a2.zip.006CFD model a2 PART7/7suction_model_PP&SVW2018_a2.zip.007CFD models c1 and c2 PART1/5Ansys 19.0 Workbench project file that contains the model and data for the simulation described in the article as "model c1" and "model c2". Raw data files can be found under /dp0/FFF-2/Fluent, /dp0/FFF-3/Fluent. Zip file, 4.09 GB.suction_model_PP&SVW2018_c1_c2.zip.001CFD models c1 and c2 PART2/5suction_model_PP&SVW2018_c1_c2.zip.002CFD models c1 and c2 PART3/5suction_model_PP&SVW2018_c1_c2.zip.003CFD models c1 and c2 PART4/5suction_model_PP&SVW2018_c1_c2.zip.004CFD models c1 and c2 PART5/5suction_model_PP&SVW2018_c1_c2.zip.005