Brodarski Institute

e44a6f32e15cb53ee479b2697e759e2e_LBrodarski Institute is a research and development institute in the field of applied technical sciences and technology. The Institute is a limited liability company in the ownership of the Republic of Croatia. It’s more than 60 years of experience in development of complex systems and products enabled it to develop a large specter of scientific disciplines, appropriate infrastructure and human resources. It is situated in the Croatian capital Zagreb on an area of 150.000 sq. meters, with 32.000 sq. meters of labs and offices and employs about 100 full time and 30 to 50 part time researchers.

Brodarski Institute activities cover four large industry segments:

  1. Marine technologies and waterways transport
  2. Control engineering
  3. Renewable energy production and ecological engineering
  4. Road transport

From year 2007 Numerical hydrodynamics department becomes integral part of Marine technologies and waterways transport activities. Although founded with intention to complement experimental marine hydrodynamics, very soon requests for conduction of numerical simulations in field of Civil Engineering have been emerged. Starting with fire simulations in sport centers, our activities rapidly extended to ventilation operation and CO extraction in underground parking garages and operation of data center cooling systems.

NUMERICAL EVALUATION PROGRAM OF AZIMUTH PUSHING TYPE THRUSTER

Azimuth pushing type thruster evaluation program was consisting from numerical simulations of housing resistance, propeller and thruster unit open water flows for model and full scale ratios.

Main characteristics of numerical simulation setup were:

  • Spatial discretization: three dimensional
  • Time modeling schemes:

Housing resistance: steady

Propeller open water tests (POWT): steady

Thruster open water tests (TOWT): unsteady

  • Type of flow: viscous turbulent
  • Turbulence modeling:
    • Housing: k-e RNG, Non Equilibrium Wall Function
    • Propeller: k-w SST, Transitional Flows
    • Thurster: k-e RNG, Non Equilibrium Wall Function
  • Rotational modeling schemes:
    • POWT: Rotating Moving Reference Frame
    • TOWT: Sliding mesh

ANALYSIS OF ENGINE ROOM FIXED CO2 FIRE EXTINGUISHING SYSTEM OPERATION

The analysis was set to obtain the mass transfer of CO2 released at Engine Room in case of fire under assumption of incomplete closure of starboard side installed fire dampers.
Main characteristics of numerical simulation setup were:

• Spatial discretization: three dimensional
• Time modeling scheme: unsteady
• Fire model: volumetric heat source (NFPA 204)
• Species transport: three component mixture (CO2-CO-air)
• Natural convection: full buoyancy effects
• Density formulation: incompressible ideal gas
• Thermal conductivity: mass weighted mixing law
• Type of flow: viscous turbulent
• Turbulence model: κ-e Realizable




ANALYSIS OF DATA CENTER COOLING SYSTEM OPERATION

The analysis was set to obtain the effectiveness of data center cooling system after modification set to improve working conditions of installed equipment.
Main characteristics of numerical simulation setup were:

• Spatial discretization: three dimensional
• Time modeling scheme: steady
• Natural convection: full buoyancy effects
• Density formulation: incompressible ideal gas
• Type of flow: viscous turbulent
• Turbulence model: κ-ω Standard, Shear Wall Correction