FEM Analysis of Fluid-Structure Interaction in Thermal Heavy Oil Recovery Operations

DIFIS System was developed for oil recovery from shipwrecks and for the elimination of the pollution threat during EU FP-6 framework. The installation time’s reduction in cases of environmental pollution is a crucial factor for DIFIS system design. In the current work, the polyethylene riser tube parts (15 meter) of DIFIS System was replaced by a composite riser tube parts (30 meter) succeeding lower installation time for the DIFIS’s riser. The analysis and development of composite riser was based on the verified 2 – way fluid structure interaction (FSI) results from polyethylene riser. A methodology based on polyethylene riser’s normal modes (target values) was proposed and the composite riser’s structural integrity was investigated in order to reach these target values. The normal modes analysis and the 2 – way fluid structure interaction simulation were performed in ABAQUS software. The composite riser’s dynamic response under sea current is significant better than polyethylene riser (lower displacements in both axes, parallel and vertical to flow). In overall, the time reduction of the DIFIS’ risers installation by 40% was achieved, using longer riser parts.

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Study of Fluid–Structure Interaction in a Functionally Graded pH-Sensitive Hydrogel Micro-Valve

International Journal of Applied Mechanics ◽

10.1142/s175882512050057x ◽

2020 ◽

Vol 12 (05) ◽

pp. 2050057 ◽

Cited By ~ 1

Author(s):

Hashem Mazaheri ◽

Amir Ghasemkhani ◽

Soroush Sabbaghi

Keyword(s):

Fluid Structure Interaction ◽

Fem Analysis ◽

Ph Sensitive ◽

Functionally Graded ◽

Third Party ◽

Smart Devices ◽

Cross Linking ◽

Fluid Structure ◽

Structure Interaction ◽

Significant Difference

In this work, fluid–structure interaction (FSI) simulations, as well as non-FSI ones, are conducted to study the behavior of a functionally graded (FG) pH-sensitive micro-valve. The FEM analysis of the hydrogel is performed in ABAQUS while the fluid domain is analyzed in ANSYS fluent. To investigate the FSI and FG effects, both FSI and non-FSI simulations are performed for pH-sensitive micro-valve with homogeneous cross-linking distribution beside the FG cases. Two simulation domains are coupled by using a third-party software named MpCCI for both FSI and non-FSI simulations. For the FG hydrogel, linear and exponential property distributions are considered. The obtained results show a significant difference between the FG and homogeneous hydrogel behavior for both simulation methods. Additionally, the results emphasize that FSI consideration has a crucial role in the design of these smart devices. Especially, remarkable difference is observed for the closing pH of the micro-valve as well as the flow-rate diagrams. For example, a leakage is observed in FSI simulations for the closing pH of the non-FSI simulations that indicates the importance of the FSI effect. Finally, the effect of the cross-linking density distribution and the inlet pressure of micro-valve are studied and the results are analyzed.

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