Development of a numerically efficient approach based on coupled CFD/FEM analysis for virtual fire resistance tests—Part B: Deformation process of a steel structure

Abstract

SummaryIn the present study, the structural analysis of a three‐parted steel door during a fire resistance test was examined by FEM simulation. The structural analysis is part of a coupled CFD/FEM simulation approach developed for the prediction of fire resistance tests. The basis of this follow‐up work was the calculated temperature in the test specimen from CFD to predict the thermal stresses, deformation and gap formation between the door parts. The spatial information of the temperature in the test specimen was exported. Subsequently, the thermal expansion of the door and the resulting stresses and gaps were calculated. To validate the FEM simulation, the deformation of the steel door was observed. It was found that the simulation predicted the deformation of the steel door in close accordance to the measurement. The maximum displacement was found in the centre of the construction with 141 mm, whereas the simulation predicted a value of 133 mm. In addition to the deformation of the door, also the prediction of the gap formation was validated against the flue gas leakage. The first flue gas exit occurred already after 120 seconds, which was in spatial and temporal conjunction with the maximum gap predicted in the simulation.

Experimental analysis of the wall deformation of masonry brick and gypsum‐sheathed stud walls during standardized fire resistance tests of steel doors

“…Furthermore, in numerical simulations of FRTs commonly the test specimen without adjacent wall construction was taken into account, which may lead to deviations between the numerical and experimental results for the deformation. For example, this was shown by Prieler et al, 27,28 where a coupled CFD/FEM simulation approach was used to calculate the gas phase combustion, heat transfer in the test specimen and its deformation. The neglected wall deformation was identified as crucial to calculate the test specimen's deformation in a better accordance to the measurement.…”

“…Despite the fact that the wall deformation is crucial for the gap formation and flue gas leakage between the door and the wall, the present study did not consider the time when a critical flue gas leakage occurred, which would lead to the end of the experiment. The gap size and flue gas leakage will be also affected by other parameters, such as position of the door, 25 local pressure level in the furnace, 28 usage of intumescent materials at the door etc. Therefore, the maximum testing time of the test specimen (steel door) dependent on the wall deformation was not part of this study.…”

Numerical Simulation of Fire Resistance Test for Gas Turbine Component Using Coupled CFD/FEM Approach

“…The necessity to predict the behavior of the component under fire stress is confirmed by the breadth of scientific research on this topic [3][4][5][6][7][8][9][10][11]. The most promising and accurate approach is based on coupled CFD-FEM analysis of the component behavior under fire-resistance tests.…”

“…The most promising and accurate approach is based on coupled CFD-FEM analysis of the component behavior under fire-resistance tests. Detailed description of this approach can be found in the research of Prieler et al [3,4] and Malendowski [5].…”

“…Unlike other research [3][4][5][6][7][9][10][11] where all tests are performed on simplified models/coupons, this study analyses highly detailed complex geometry multimaterial assembly of the real component used in operational gas turbine engine. Moreover, it is typical for academia that experiment and computational analysis is performed by the same group of people working on the same project, which provide opportunity to tune the model to experimental results.…”