This is a development version of the SIMA documentation. You will find the official version at sima.sintef.no

Lazy Wave Wizard

Creates a lazy wave riser from the hang-off point to an anchor on the seafloor.

There are two ways to open the wizard:

  1. When creating a new RIFLEX task: choose Lazy Wave under Create using configuration

  2. In a an existing RIFLEX task: click on Slender System, select Create Line and choose Lazy Wave under Create using configuration

See also Slender System Overview.

The riser is built from three sections:

  • an upper pipe section

  • a buoyancy section

  • lower pipe section resting on the seafloor

Lazy wave configuration
Figure 1. Lazy wave riser

1. Location

  • Water Depth: water depth at the location. If the task is not yet part of a workspace, the water depth and flat bottom of the location are set to this value.

2. Hangoff properties

Hang-off coordinates and horizontal hang-off angle
Figure 2. Hang-off coordinates and horizontal hang-off angle

  • Horisontal Hangoff Angle: horizontal hang-off angle, relative to global x

  • Use Vertical Hangoff: specify the vertical hang-off angle. When checked:

    • Vertical Hangoff Angle: vertical hang-off angle, relative to global z

  • Coordinates: hang-off position in the global system

  • Horizontal Distance To Anchor Point: horizontal distance from the hang-off point to the anchor

3. Upper section

Pipe cross section
Figure 3. Pipe cross section

  • Section length: total length of the upper section

  • Element length: length per element for the upper section

  • Internal fluid density: density of the internal fluid. Leave at 0 for no internal fluid.

  • Pipe Diameter: outer diameter of the pipe

  • Pipe Thickness: wall thickness of the pipe

  • Pipe Material: Low Alloy or Stainless Steel

The pipe cross section, internal fluid and material are shared by all three sections.

4. Buoyancy section

Buoyancy modules
Figure 4. Buoyancy modules

  • Section length: total length of the buoyancy section

  • Element length: length per element for the pipe between the buoys

  • Center To Center: distance between the centers of two neighbouring buoys

  • Buoy Length: length of each buoy

  • Buoy Density: density of the buoyancy material, modelled as external coating of the pipe

  • Buoy External Diameter: outer diameter of the buoys. Must be larger than Pipe Diameter.

5. Lower section

  • Section length: total length of the lower section

  • Element length: length per element for the lower section

6. Created model

The wizard adds the following to the slender system:

  • A reference frame at the hang-off position, rotated by the horizontal hang-off angle

  • Supernodes hangoff, sn_buoy_up, sn_buoy_low and anchor

  • Lines line1 (upper), line2 (buoyancy) and line3 (lower), each with its own line type

  • Thin-walled pipe cross sections cs_line and cs_bouyancy

  • An internal fluid, if Internal fluid density is larger than 0

  • Seafloor spring contact on the lower section

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