1. LINFLOW 1.41 Fluid-Elastics Investigation of an Off-shore System. Fluid dynamics: Methane gas U= 20 m/s Structure L=0.238 m Out. Dia.=0.210 m Inn. Dia.=0.190 m E=210E9 Pa Dens=7800 kg/m3 Description The Structural Model

2. LINFLOW 1.42 The ANSYS first and second modal frequency are 2.47 Hz and 4.45 Hz. Structural Results for Pipe used in a Fluid- Elastics Analysis. The ANSYS Structure Dynamics The first structural modeThe second structural mode

3. LINFLOW 1.43 LINFLOW Fluid Dynamic Analysis of Unsteady Pressure into the System Mean static pressure plot Pressure oscillations into the flex loop Frequency spectrum of pressure oscillations

4. LINFLOW 1.44 LINFLOW Fluid-Elastics Analysis of the System. Eigenvalue Analysis of the Fluid-elastic mode Mode NumberFrequency (Hz)Damping Requirem ent. 12.280.00014 24.280.00011 35.730.00044 46.830.66E-4 58.860.00021 614.20.00059 715.330.00050 817.870.00043 919.380.00116 1026.670.00085 1131.110.00078 1237.050.00108 1337.320.00223 1454.710.00025 Real Part Imaginary Part 0.1673E-01 0.3552E-02 -0.2276E-01 -0.4744E-02 0.1533E-02 0.3096E-03 -0.1504E-01 -0.3198E-02 -0.6179E-02 -0.1243E-02 -0.6590E-01 -0.1280E-01 0.1796E-01 0.2236E-02 0.4159E-01 0.6234E-02 -0.1535E+00 -0.2981E-01 -0.4686E+00 -0.5919E-01 -0.8523E+00 -0.1456E+00 0.4906E-01 0.5806E-02 -0.5091E-02 -0.1070E-02 0.3522E-01 0.7705E-02 Eigenvector of the 13.th Fluid-elastic mode