About Madhusuden Agrawal

Madhusuden Agrawal is a principal engineer at ANSYS, Inc. He has 20+ years’ experience in numerical modeling of fluid flow and mass/heat transfer. His expertise includes cutting-edge, industrial-strength CFD analysis, simulations and optimization in wide range of applications in oil and gas, chemical, biomedical, pharmaceutical, petrochemical, materials and consumer products. Mr Agrawal obtained his master’s degrees from the Indian Institute of Technology, Kanpur India; his MBA is from Franklin Pierce College, NH.

Seakeeping – Wet Deck Slamming on Offshore Ships

How can we accurately predict wave impact loads on ships for seakeeping? Some of the important parameters related to ship hull design include ship motions, vertical accelerations, wave impact/slamming loads, and deck wetness. The ABS Guide for Building and Classing High Speed Naval Craft (HSNC 2007) clearly states that slamming impact load is one of the most critical factors for the scantling design of hull structures. Accurate prediction of wave impact loads requires solving three problems. First is the prediction of wave kinematics, second is the prediction of the pressure and viscous forces and the third is the prediction of ship motion during the wave impact. It is possible to simulate all of these problems with ANSYS computational fluid dynamics (CFD) software. Continue reading

High-Fidelity Modeling for Installation of Subsea Structures in the Splash Zone

subsea manifold

3D Computational Domain including Detailed Geometry of a Subsea Manifold

Lowering subsea structures and equipment into the splash zone is a critical part of offshore installation campaigns. In preparation, engineering teams perform many installation analyses to ensure sufficient crane capacity, clearance and accessibility, structural integrity, and equipment/structure stability. Traditional low-fidelity approaches rely on simplified formulations or empirical equations; some consist of model tests to determine wave loads on structures. But these traditional approaches cannot simulate wave-structure interaction nor the dynamic stress and deformation of structure/equipment due to wave slamming. And hence the accuracy is always a key concern. Continue reading