Anders Lennart Östman
Seniorforsker
Anders Lennart Östman
Seniorforsker
Publikasjoner og ansvarsområder
Study on Additional Ship Resistance due to Roughness using CFD
The additional resistance due to roughness is studied by means of CFD simulations. The KVLCC2 hull at full-scale Reynolds number is considered as a test case. A wall function formulation is used to model the rough wall turbulent boundary layer, where the roughness function is based on data from...
Computational Fluid Dynamics Reproduction of Nonlinear Loads on a Vertical Column during Extreme Irregular Wave Events
Recently, a method for numerical reproduction of measured irregular wave events has been developed. The measured motion of the wave maker flaps defines the wave kinematics at the boundary of the numerical simulation in order to generate the waves. When such data are not available, the control signal...
OMAE2017-62643 New Combined CFD and Model Testing Technique for Identification of Wave Impact Loads on a Semisubmersible
A procedure is presented describing how to estimate realistic loads using combined numerical and model test data. Measured platform motions are imposed on the structure during the CFD analysis. The combination of the wave matching procedure with the imposed measured platform motion gives a very good...
Numerical and Experimental Investigation of Roughness Due to Different Type of Coating
Effect of roughness on frictional resistance is investigated experimentally and numerically. Resistance tests are performed with several plates coated with different paints, which have different roughness. Front plate is 4 m long and aft plates are 6 m long resulting in a total hydrodynamic length...
OMAE2017-62643 New Combined CFD and Model Testing Technique for Identification of Wave Impact Loads on a Semisubmersible
Estimation of Wave Loads due to Green Water Events in 10000-Year Conditions on a TLP Deck Structure
CFD Reproduction of Model Test Generated Extreme Irregular Wave Events and Nonlinear Loads on a Vertical Column
Recently, a method for numerical reproduction of measured irregular wave events has been developed. The measured motion of the wave maker flaps defines the wave kinematics at the boundary of the numerical simulation in order to generate the waves as described in (Pakozdi, Kendon, & Stansberg...
Estimation of Wave Loads due to Green Water Events in 10000-Year Conditions on a TLP Deck Structure
In order to provide qualitative and quantitative information on the hydrodynamics loads during green water events on a module on the deck of a TLP in 10000-year conditions, MARINTEK has carried out CFD simulations. This paper presents extreme wave events and corresponding hydrodynamics loads on the...