cfd.ulsan.ac.kr // computational ship hydrodynamics lab
School of Naval Architecture & Ocean Engineering University of Ulsan Established 2008

Hyung Taek Ahn안형택

Building computational tools to see how ships move through water — one unstructured mesh at a time.

Computational Fluid Dynamics
Ship Hydrodynamics
High-Order Numerical Methods

ULSAN3D · H.T.AHN
Fig. 01 — Vortical wake of a spinning golf ball, ULSAN3D Cartesian mesh / λ₂ isosurface · ASME Flow-Vis Award 2019
Identity
Professor School of Naval Architecture & Ocean Engineering, University of Ulsan
Office Bldg. 41 · Room 318 +82 (0)52 259 2164
Email htahn (at) ulsan.ac.kr youtube · github @ulsan3d
— 01 / Research

Selected visualizations

A small gallery of recent simulations from ULSAN3D — the lab's in-house unstructured-mesh CFD solver, developed continuously since the early 2000s.

KCS — Bow Breaking Wave ULSAN3D · AHN
BB2 Submarine — Free-Surface Wake ULSAN3D · AHN
KCS — Divergent Breaking Wave ULSAN3D · AHN
Breaking Wave — LES Comparison ULSAN3D · AHN
— 02 / Trajectory

Education
& career

2017—
Professor University of Ulsan
2016—17
Visiting Professor Dept. MAE, Prof. Hong Luo's Group, NC State University
2008—17
Assistant → Associate Professor University of Ulsan
2006—08
Postdoctoral Research Associate Theoretical Division, Los Alamos National Laboratory · Dr. M. Shashkov
2005—06
Research Scientist · Adjunct Professor ICES & Dept. ASE/EM, The University of Texas at Austin
2001—05
Graduate Research Assistant Offshore Technology Research Center, The University of Texas at Austin
1999—2005
PhD, Aerospace Engineering Dept. of ASE/EM, The University of Texas at Austin · Prof. Y. Kallinderis & Prof. C. Dawson
— 03 / Solver

ULSAN3D

A high-order computational framework for ship hydrodynamics — designed from the outset to span RANS to large-eddy simulation, with free-surface dynamics, fluid–structure interaction, and 6DOF body motion natively coupled within a unified unstructured/Cartesian overset-grid solver. — On the design philosophy of ULSAN3D

3D
Hybrid unstructured/Cartesian overset grid — tet, prism, pyramid, hex
HO
High-order finite volume / DG spectral element
FSI
Fluid–structure interaction · ALE · moving meshes
6DOF
Six degree-of-freedom body motion · maneuvering simulation
— 04 / Selected Publications

Recent
writings

Eight selected papers from a longer record. Full publication list available on Google Scholar.

  1. /01 Flow Control of a Rim-Driven Propeller Using Vortex Generators for Enhanced Open-Water Performance Journal of Marine Science and Engineering 2026
  2. /02 Dynamic Tumble Stability Analysis of a Hexapod Underwater Walking Robot OCEANS 2025–Great Lakes (IEEE) 2025
  3. /03 Optimal Attitude Determination for the CR200 Underwater Walking Robot Applied Sciences 2024
  4. /04 High-Order WENO-based Semi-Implicit Projection Method for Incompressible Turbulent Flows: Development, Accuracy, and Reynolds Number Effects Int. J. Computational Fluid Dynamics 2023
  5. /05 Discontinuous Galerkin Spectral Element Method for Elliptic Problems Based on First-Order Hyperbolic System J. KSIAM 2021
  6. /06 Numerical Simulation of Flow over Stationary and Rotating Golf Ball on Cartesian Grid ASME J. Fluids Engineering 2020
  7. /07 Hyperbolic Cell-centered Finite Volume Method for Steady Incompressible Navier–Stokes Equations on Unstructured Grids Computers & Fluids 2020
  8. /08 A Geometric Multigrid Accelerated Incompressible Flow Simulation over Complex Geometries Computers & Fluids 2020
See full record on Google Scholar →