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CFD Code


Computer simulations at IIHR are complemented by model-scale physical experiments.

Computer simulations at IIHR are complemented by model-scale physical experiments.

CFDShip-Iowa is general-purpose computational fluid dynamics (CFD) simulation software developed at the University of Iowa’s IIHR—Hydroscience & Engineering. CFDShip-Iowa represents, in part, deliverables for sponsored research funding from the Office of Naval Research. CFDShip-Iowa has been a leading ship hydrodynamics CFD code for more than 20 years. The code has been verified and validated for many applications, including high-speed vessels. The current available versions are including CFDShip-Iowa V4.5, V6.1, V6.2, and V6.25.

CFDShip-Iowa V4.5 is an incompressible URANS/DES solver designed for ship hydrodynamics using structured multiblock and overset grids. A single-phase level-set approach is used for free-surface tracking and a semi-coupled air/water immersed boundary method is employed for two-phase computations. The functionalities of the code include 6DOF motions, turbulence modeling, moving control surfaces, multi-objects, advanced controllers, propulsion models, incoming waves and winds, bubbly flow, and fluid-structure interaction.

CFDShip-Iowa V6, with fully coupled two-phase flow solvers,  is already under development for milestone achievement in increased capability focusing on orders of magnitude improvements in accuracy, robustness, and exascale HPC capability. The level set based ghost fluid method is used for sharp interface treatment with a volume-of-fluid (VOF) method for interface tracking. Current capabilities are for Cartesian grids with immersed boundary methods (V6.1), for orthogonal curvilinear grids (V6.2), for overset Cartesian/orthogonal curvilinear grids (V6.25), and extensions in progress for non-orthogonal curvilinear grids (6.3). Functional areas include fast model-scale sinkage, trim prediction, and other fundamental studies, such as water impact and slamming (V6.1); wave breaking and wave-body interactions with simple geometries such as cylinder, sphere, wedge, foil, and small-scale interfacial phenomena, such as bubble/droplet size and distribution (V6.2). V6.3 will be a general multi-block structured grid solver based on V6.1 and V6.2. It will maintain and extend the higher-order advection and volume conservative interface tracking schemes, and enhanced capabilities of handling complex geometries in ship hydrodynamics with all the grids and functional areas found in V4.5.


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Last modified on July 1st, 2015
Posted on March 15th, 2012