Research on Risk Assessment and Prevention of Dewing on the Surface of the Thousand-handed Avalokitesvara Statue Based on COMSOL and CFD

School of Civil Engineering, Chongqing University, Chongqing, China

^* Corresponding author: xuelianbai@163.com

Abstract

The Thousand-handed Avalokitesvara statue in Dazu Stone Carving has been in a high temperature and humidity environment with serious air pollution for a long time. Under the combined effect of various environmental factors, its surface disease is extremely serious. Among them, condensation disease is one of the main diseases of the Thousand-handed Avalokitesvara statue, and also the root cause of other diseases. The surface temperature of the Thousand-handed Avalokitesvara statue was simulated by COMSOL simulation technology, and compared with the dew point temperature of the air near the wall at the same time, the seasonal and daily variation laws of the condensation risk on the image surface were analysed. To effectively prevent surface condensation, a three-level condensation risk assessment level was established based on the difference between the surface temperature and the dew point temperature near the wall. Summer is a period of high risk of condensation, during field investigation, it was found that under the condition that dehumidification measures have been added, a large area of condensation still occurs on the statue surface in summer. According to the actual measurement of the core area where the Thousand-handed Avalokitesvara statue is located, it was found that there were obvious differences between the near wall measuring points and those far away, the near wall air fluidity was poor, and the actual application effect of dehumidification equipment was poor. In order to better create a suitable storage environment and avoid condensation, based on CFD simulation technology, the distribution law of the internal environmental parameters of the Dabei Pavilion under different optimization prevention and control schemes was studied, and the optimal optimization scheme of closing the steam inlet and adding dehumidifiers was proposed, which could reduce the relative humidity and dew point temperature of the air near the wall of the Thousand-handed Avalokitesvara statue by 12.6% and 3ºC respectively, effectively reducing the risk of condensation.