Test Case 1.3

DTMB5415 [Geometry]

Conditions

• Towing condition in still water
• Trim and sinkage free
• Without rudder

Froude number ( Fn )	Reynolds number ( Rn )
0.28	1.26×107

Items and Remarks

Figure Number	Items	Remarks
	Integral variables: Coefficients of    total resistance (CT), split into    pressure (CP) and    friction (CF) components and Uncertainty analysis( USN, UV, E )	Experimental results are available Table UD = 2.2 [%CT]
	Sinkage and trim:     (dF+dA)/2 LPP,     (dF-dA)/2 LPP, where dF and dA are dipping at FP and AP. and Uncertainty analysis	Sinkage: UD = 1.40 [ % LPP] Trim: UD = 1.83 [ % LPP]
Fig. 1.3-1	Wave profile on the hull	To be compared with the experimental results download (The above experimental result was transformed in the earth-fixed coordinate on Jan/13,2005.)
Fig. 1.3-2	Hull surface pressure contours( bottom view )
Fig. 1.3-3	Wave-elevation contours ( global wave field )

*: To be determined

• Coordinate system for comparisons is fixed to midship on the undisturbed waterplane.
• All quantities are non-dimensionalized by density of water ( $\rho$ ), ship speed ( $U$ ), and length between perpendiculars ( $L_{PP}$ ):

  $$F_n = \dfrac{U}{\sqrt{g \cdot L_{PP}}}, \quad R_n = \dfrac{U \cdot L_{PP}}{\nu}$$

  
  
  where $g$ is the gravitational acceleration and $\nu$ is the kinematic viscosity.
• All CFD predicted force coefficients should be reported using the provided ( Geometry page ) wetted surface area at rest ( $S_{0}$ ). Force coefficients are defined as follows:

  $$C_{T} = \dfrac{R_{T}}{\frac{1}{2} \rho U^2 S_{0}}, \quad C_{F} = \dfra... ...1}{2} \rho U^2 S_{0}}, \quad C_{P} = \dfrac{R_{P}}{\frac{1}{2} \rho U^2 S_{0}}$$