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- W70707310 abstract "This paper presents multiphysics modeling and evaluation on Test 1 (the first 24 hours) of SubTask2 ME2 using COMSOL 3.3 in the form of six cases. Case A is the reference case (with perfectly air tight gypsum). Compared to the measurements the simulation results of case A show an underestimation of the Rh responses. Case B, investigates the influence of a reversed air velocity profile (again with perfectly air tight gypsum). The results show that this has almost no effect on the Rh responses. Cases C through E investigate the influence of air permeable gypsum. These cases show that a mean velocity in the gypsum of order ~10-5 m/s is required to 'fit' the measured Rh responses. Although this seems already quite a low velocity it is 3 orders of ten higher than the estimated velocity calculated by taking a permeability of 4.10 –9 [kg.m-1.s-1.Pa-1] for the gypsum and estimated pressure gradient of 2 [Pa.m-1]. Finally, case F investigates the effect of a small air gap between the top two layers of the gypsum bed. This case shows that a relative small gap where air movement can take place might have a major effect on the results. Overall the simulation results indicate that the requested results of the Rh in gypsum are dependent on both the air permeability of gypsum and airflow through cracks and gaps between the pieces. By tuning these (so far unknown) quantities, the simulation results can relatively easy be 'fitted' with the experimental results. This could mean that additional measurements of the air permeability and air tightness of the gypsum pieces are needed to validate combined CFD HAM models." @default.
- W70707310 created "2016-06-24" @default.
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- W70707310 date "2007-01-01" @default.
- W70707310 modified "2023-09-27" @default.
- W70707310 title "Additional Multiphysics modeling & analysis on test 1 of ST2/ME2 using COMSOL" @default.
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