Computational Ship Hydrodynamics

MOERI Propeller

This area of research is coordinated by the ship hydrodynamics group, www.iihr.uiowa.edu/~shiphydro.CFDShip-Iowa is a research code developed under sponsorship of the Office of Naval Research for the past 20 years, with vast capabilities for ship hydrodynamics, enabling some of the most complex and advanced computations possible today.

Athena R/V KCS

ONRtumblehome

DTMB 5415

Fluid-Structure Interaction

MOERI Propeller

22

Associate forcefluid to structure

Associate disp.structure to fluid

Structure analysis

For displacement

Sol

ve fl

ow fie

ldW

ith n

ew g

rid

VBM

(kg×

m)

-2

-1

0

1

SG1

VBM

(kg×

m)

-2

0

2

SG2

Time (s)

VBM

(kg×

m)

8.8 9.0 9.2 9.4 9.6 9.8-2

-1

0

1

2

ExperimentRigid modelOne-wayTwo-waySG3

t/T

Fx

0.0 0.2 0.4 0.6 0.8 1.01.60

1.65

1.70

1.75

1.80

1.85

1.90Non-deformationSmall DeformationLarge DeformationLarge Deformation in Boundary Layer

The Fluid-Structure Interaction capabilities in CFDShip-Iowa were added under a grant from the Office of Naval Research for use in ship hydrodynamics problems, like slamming and whipping. The code has recently been applied to wind turbine flows, under a grant from NCCS for supercomputer usage.

NREL Phase VI wind turbine

S175 container ship

Two-Phase Flow Modeling and Experimentation

The research in multiphase flow is focused in study of bubbly flows in the presence of a free surface. To measure gas volume fraction, bubble velocity and bubble size distribution we develop optical phase detection probes made of sapphire fibers, with capability to measure in full-scale environments. We are also interested in numerical modeling of bubble entrainment, transport and dissolution. The research in two-phase flow is supported by the Office of Naval Research and the National Science Foundation.

IIHR 50 micron sapphire probe, 15 micron tip

170 micron radius bubble

Bubbly surface jets

Phase-detection probes

Bubbly flow in ships