Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Numerical Simulation and Analysis of Temperature Field and Airflow Field of Deep Sea Manned Diving
SystemChengjun Gao, Lei Jiang, Weizhe Xu, ShenShen Yang
China ship scientific research center
Wuxi City, JiangSu Province, China
methods mainly include model test and computational fluiddynamics(CFD method). With the rapid development of computertechnology, CFD is more and more favored by people because of its
unique advantages such as low cost, fast speed, complete data and cansimulate various working conditions. Nielsen(1974) of Denmark first
applied CFD technology to air conditioning engineering in 1974 tosimulate indoor air flow. Since then, CFD method has been
continuously developed in the field of air conditioning (RAHNOOD,1995; TEODOSIU, 2000). Kacira et al(2004) Used k   turbulencemodel to simulate the spatial distribution of temperature in Venlo
greenhouse under natural ventilation, and Bailey et al(2005) used CFD
method to simulate the spatial distribution of temperature in Venlo
multi span greenhouse under mechanical ventilation. In recent years,
many Chinese scholars(Ren,2015; Zhou,2015) have also carried out
CFD research on cases with specific air flow quality needs, and madegood research progress.
Generally, in the absence of special requirements, the design of air
distribution is generally calculated by the formula in codes andstandards to provide basis for design. For the unconventional schemewith high requirements for air quality or this paper, it is necessary tocarry out special research at the beginning of design.CFD technology is
undoubtedly the simplest method, especially for the situation that is notsuitable for experimental research. It is a very scientific method fordesigners to guide the design according to the CFD simulation results tomake the design more reasonable.
Therefore, in order to meet the environmental requirements of the cabin
staff, at the beginning of the design, this paper carried out the overall air
distribution simulation of the deep-sea manned diving system, in orderto provide technical basis for the scientific design of the diving system.

ABSTRACTDue to the specific operation requirements, the deep-sea manned diving
system studied in this paper is different from the conventional
submersible. Its unconventional design and layout lead to the change of
air distribution mode. Therefore, in order to meet the environmental
requirements of cabin staff, at the beginning of the design, this paper
carried out the numerical simulation of air distribution of the wholecabin system. The governing equations used in the numericalcalculation in this paper include continuity equation, momentum
equation and energy equation, and the turbulence model adopts modelk   . The computing domain adopts a combination of structured andunstructured network, and locally encrypts the key areas. According to
the numerical simulation results, the distribution of temperature fieldand velocity field in the whole diving system under the condition of air
supply at both ends of the living cabin is analyzed. According to thenumerical simulation results, the nonuniformity coefficients of velocity
field and temperature field in key areas are given. In this paper, thesimulation results provide a technical basis for the overall air
distribution design of diving system and point out the direction for
optimization research.

KEY WORDS: diving system; air flow; temperature field; velocityfield.

INTRODUCTION
Due to the specific operation requirements, the deep-sea manned diving
system studied in this paper is different from the conventional
submersible. It consists of three parts, and the internal layout is morecomplex. Its unconventional design and layout lead to the previous air
distribution mode is no longer applicable. Another feature of the diving
system is that the continuous working time of the staff in the cabin islong. Short work, to a certain extent, people's requirements for theenvironment are generally not high. However, the information in theconfined space is complete and the work can last for tens of days. In thiscase, the cabin personnel are very concerned about the quality of theenvironment. The air quality and ambient temperature in the SDC
system will not only directly affect the work efficiency of staff, but also
affect their health to a great extent.
Indoor air quality directly affects people's production, life and health.
From the perspective of ventilation and air conditioning, the research

COMPUTATIONAL MODEL
The deep-sea manned diving system studied in this paper consists ofthree parts: two living compartments and an intermediate conversion
module. There are tables, chairs, beds, boxes and other living and rest
facilities in the cabin. The internal arrangement of the two living
quarters is the same. They are perpendicular to each other andconnected by the middle cabin. The connection port is approximately
circular for staff to walk and maintain the flow of air. There are twogroups of air supply outlets and air return outlets, which are respectively
located above the section of the living cabin away from the middle
cabin.

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