Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An improved explicit scheme for whole-building hygrothermal simulation   Implicit schemes require important sub-iterations when dealing with highly
nonlinear problems such as the combined heat and moisture transfer through
porous building elements. The computational cost rises significantly when the
whole-building is simulated, especially when there is important coupling among
the building elements themselves with neighbouring zones and with HVAC (Heating
Ventilation and Air Conditioning) systems. On the other hand, the classical
Euler explicit scheme is generally not used because its stability condition
imposes very fine time discretisation. Hence, this paper explores the use of an
improved explicit approach - the Dufort-Frankel scheme - to overcome the
disadvantage of the classical explicit one and to bring benefits that cannot be
obtained by implicit methods. The Dufort-Frankel approach is first compared to
the classical Euler implicit and explicit schemes to compute the solution of
nonlinear heat and moisture transfer through porous materials. Then, the
analysis of the Dufort-Frankel unconditionally stable explicit scheme is
extended to the coupled heat and moisture balances on the scale of a one- and a
two-zone building models. The Dufort-Frankel scheme has the benefits of being
unconditionally stable, second-order accurate in time O(dt^2) and to compute
explicitly the solution at each time step, avoiding costly sub-iterations. This
approach may reduce the computational cost by twenty, as well as it may enable
perfect synchronism for whole-building simulation and co-simulation.

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The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin