کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6479269 1428374 2017 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Accurate numerical simulation of moisture front in porous material
ترجمه فارسی عنوان
شبیه سازی دقیق عددی رطوبت در مواد متخلخل
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی


- Two numerical schemes are studied to solve advection-diffusion equation of moisture.
- Efficiency of the Scharfetter-Gummel scheme is enhanced as more accurate and faster.
- Numerical results are compared to experimental data of moisture transfer.
- Inclusion of advective term in the model lead to better results than diffusive model.

When comparing measurements to numerical simulations of moisture transfer through porous materials a rush of the experimental moisture front is commonly observed in several works shown in the literature, with transient models that consider only the diffusion process. Thus, to overcome the discrepancies between the experimental and the numerical results, this paper proposes to include the moisture advection transfer in the governing equation. To solve the advection-diffusion or the so-called convection differential equation, it is first proposed two efficient numerical schemes whose efficiencies are investigated for both linear and nonlinear cases. The first scheme, Scharfetter-Gummel, presents a Courant-Friedrichs-Lewy (CFL) condition but it is more accurate and faster than the second one, the well-known Crank-Nicolson approach. Furthermore, the Scharfetter-Gummel scheme has the advantages of being well-balanced and asymptotically preserved. Then, to conclude, results of the convective moisture transfer problem obtained by means of the Scharfetter-Gummel numerical scheme are compared to experimental data from the literature. The inclusion of an advective term in the model may clearly lead to better results than purely diffusive models.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Building and Environment - Volume 118, June 2017, Pages 211-224
نویسندگان
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