Today's topic is "temperature change" in structures.
All objects around us possess energy, and their temperature changes according to the degree of that energy.During the COVID-19 era, temperature measurements of the human body were carried out on an unprecedented scale due to fever symptoms.
Various industrial facilities such as electronic equipment, thermal power, nuclear power, hydropower, and solar power plants deal with temperatures far higher than those we normally perceive.
As a result, the risk of damage due to thermal expansion increases, and in high-temperature environments, designs are applied with great sensitivity.
We are exposed to a great deal of energy and heat in our surroundings — from familiar body temperature to gas flames, solar radiant heat, and air conditioning, which we perceive and feel in various ways in daily life. However, it is not easy to quantitatively measure how much temperature actually changes over the course of daily activities. Recently, as fever has become a major issue in the COVID-19 era, we have become much more familiar with quantitative measurement methods such as thermal imaging cameras and thermometers.
In high-temperature environments — including equipment, electronic devices, and power plant components — temperatures and deformations far beyond those we normally encounter can occur, and in severe cases, damage may result. Simply put, problems can arise such as tearing due to excessive expansion at high temperatures, or melting of critical internal chip components leading to reduced efficiency or shutdown.
Temperature change is significant not only as a numerical variation but also in terms of safety, performance, energy efficiency, environmental impact, and service life management. In particular, since CAE SW applies conditions based on input data set by the user, an accurate understanding and application of virtual conditions is essential.
When performing analysis using CAE SW, a structure can be modeled in a virtual space and analyzed under various simulated conditions. A steady-state analysis can be performed quickly when needed, and when tracking changes is required, a transient-state analysis is carried out.
When performing analysis while tracking temperature changes, two factors are generally considered. The geometric shape and material properties of an object have a significant effect on heat transfer. Very large errors can arise depending on the size, shape, material characteristics, and heat transfer area of the object. In addition, initial conditions and boundary conditions are central to the analytical model.
The initial temperature distribution and heat transfer conditions at the boundaries (convection, radiation) must be set accurately. Under typical conditions, radiative heat transfer is small in scale and can be neglected; however, additional consideration is required in vacuum conditions with no medium or in high-temperature environments where significant radiative heat is generated.
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