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Isztar Zawadzki - One of the best experts on this subject based on the ideXlab platform.

  • the performance of a semi lagrangian transport scheme for the advection Condensation Problem
    Monthly Weather Review, 1995
    Co-Authors: Pierre Pellerin, René Laprise, Isztar Zawadzki
    Abstract:

    Abstract A series of numerical experiments are carried out solving a coupled set of equations for advection and Condensation with a semi-Lagrangian (SL) transport scheme. Canonical validation tests in one dimension show that SL suffers less numerical aberrations than many Eulerian transport schemes. Some monotonic transport constraints are experimented with. These tests confirm, for an SL transport, the statement first enunciated by Grabowski and Smoladdewicz within the context of Eulerian transport that monotonic transport constraints are not sufficient to prevent the development of false ripples when integrating coupled field equations. A constraint is developed and successfully applied to the simplified advection–Condensation Problem. A two dimensional dynamical model based on the fully elastic equations solved with a semi-implicit semi-Lagrangian scheme is used to simulate the classical moist bubble convection Problem; these SL solutions are compared to published results obtained with Eulerian models....

  • The Performance of a Semi-Lagrangian Transport Scheme for the Advection–Condensation Problem
    Monthly Weather Review, 1995
    Co-Authors: Pierre Pellerin, René Laprise, Isztar Zawadzki
    Abstract:

    Abstract A series of numerical experiments are carried out solving a coupled set of equations for advection and Condensation with a semi-Lagrangian (SL) transport scheme. Canonical validation tests in one dimension show that SL suffers less numerical aberrations than many Eulerian transport schemes. Some monotonic transport constraints are experimented with. These tests confirm, for an SL transport, the statement first enunciated by Grabowski and Smoladdewicz within the context of Eulerian transport that monotonic transport constraints are not sufficient to prevent the development of false ripples when integrating coupled field equations. A constraint is developed and successfully applied to the simplified advection–Condensation Problem. A two dimensional dynamical model based on the fully elastic equations solved with a semi-implicit semi-Lagrangian scheme is used to simulate the classical moist bubble convection Problem; these SL solutions are compared to published results obtained with Eulerian models....

Pierre Pellerin - One of the best experts on this subject based on the ideXlab platform.

  • the performance of a semi lagrangian transport scheme for the advection Condensation Problem
    Monthly Weather Review, 1995
    Co-Authors: Pierre Pellerin, René Laprise, Isztar Zawadzki
    Abstract:

    Abstract A series of numerical experiments are carried out solving a coupled set of equations for advection and Condensation with a semi-Lagrangian (SL) transport scheme. Canonical validation tests in one dimension show that SL suffers less numerical aberrations than many Eulerian transport schemes. Some monotonic transport constraints are experimented with. These tests confirm, for an SL transport, the statement first enunciated by Grabowski and Smoladdewicz within the context of Eulerian transport that monotonic transport constraints are not sufficient to prevent the development of false ripples when integrating coupled field equations. A constraint is developed and successfully applied to the simplified advection–Condensation Problem. A two dimensional dynamical model based on the fully elastic equations solved with a semi-implicit semi-Lagrangian scheme is used to simulate the classical moist bubble convection Problem; these SL solutions are compared to published results obtained with Eulerian models....

  • The Performance of a Semi-Lagrangian Transport Scheme for the Advection–Condensation Problem
    Monthly Weather Review, 1995
    Co-Authors: Pierre Pellerin, René Laprise, Isztar Zawadzki
    Abstract:

    Abstract A series of numerical experiments are carried out solving a coupled set of equations for advection and Condensation with a semi-Lagrangian (SL) transport scheme. Canonical validation tests in one dimension show that SL suffers less numerical aberrations than many Eulerian transport schemes. Some monotonic transport constraints are experimented with. These tests confirm, for an SL transport, the statement first enunciated by Grabowski and Smoladdewicz within the context of Eulerian transport that monotonic transport constraints are not sufficient to prevent the development of false ripples when integrating coupled field equations. A constraint is developed and successfully applied to the simplified advection–Condensation Problem. A two dimensional dynamical model based on the fully elastic equations solved with a semi-implicit semi-Lagrangian scheme is used to simulate the classical moist bubble convection Problem; these SL solutions are compared to published results obtained with Eulerian models....

René Laprise - One of the best experts on this subject based on the ideXlab platform.

  • the performance of a semi lagrangian transport scheme for the advection Condensation Problem
    Monthly Weather Review, 1995
    Co-Authors: Pierre Pellerin, René Laprise, Isztar Zawadzki
    Abstract:

    Abstract A series of numerical experiments are carried out solving a coupled set of equations for advection and Condensation with a semi-Lagrangian (SL) transport scheme. Canonical validation tests in one dimension show that SL suffers less numerical aberrations than many Eulerian transport schemes. Some monotonic transport constraints are experimented with. These tests confirm, for an SL transport, the statement first enunciated by Grabowski and Smoladdewicz within the context of Eulerian transport that monotonic transport constraints are not sufficient to prevent the development of false ripples when integrating coupled field equations. A constraint is developed and successfully applied to the simplified advection–Condensation Problem. A two dimensional dynamical model based on the fully elastic equations solved with a semi-implicit semi-Lagrangian scheme is used to simulate the classical moist bubble convection Problem; these SL solutions are compared to published results obtained with Eulerian models....

  • The Performance of a Semi-Lagrangian Transport Scheme for the Advection–Condensation Problem
    Monthly Weather Review, 1995
    Co-Authors: Pierre Pellerin, René Laprise, Isztar Zawadzki
    Abstract:

    Abstract A series of numerical experiments are carried out solving a coupled set of equations for advection and Condensation with a semi-Lagrangian (SL) transport scheme. Canonical validation tests in one dimension show that SL suffers less numerical aberrations than many Eulerian transport schemes. Some monotonic transport constraints are experimented with. These tests confirm, for an SL transport, the statement first enunciated by Grabowski and Smoladdewicz within the context of Eulerian transport that monotonic transport constraints are not sufficient to prevent the development of false ripples when integrating coupled field equations. A constraint is developed and successfully applied to the simplified advection–Condensation Problem. A two dimensional dynamical model based on the fully elastic equations solved with a semi-implicit semi-Lagrangian scheme is used to simulate the classical moist bubble convection Problem; these SL solutions are compared to published results obtained with Eulerian models....

Simindokht Saemi - One of the best experts on this subject based on the ideXlab platform.

  • Numerical investigation of a new method to control the Condensation Problem in ceiling radiant cooling panels
    Journal of Building Engineering, 2020
    Co-Authors: Mohsen Amini, Reza Maddahian, Simindokht Saemi
    Abstract:

    Abstract Radiant cooling panels are believed to be of considerable energy saving potentials and can be employed as new cooling devices in HVAC systems. Even though the popularity of radiant cooling systems grows, particularly for cooling and heating commercial buildings, the Condensation Problem limits their application. The present research is conducted to introduce and evaluate a new method to control the Condensation Problem in the Ceiling Radiant Cooling Panels (CRCP). A dehumidification coil is integrated with CRCP in order to regulate the water Condensation and remove the latent heat load. To evaluate the capability of the new model, the performance of the system was numerically investigated in a sample office, for different wall insulation and room configurations. The results showed that the integrated cooling coils enhance the natural convection heat transfer and remove the water vapor from the space. Therefore, the Condensation Problem on the CRCPs could be solved using the introduced method. The thermal comfort calculated according to temperature and humidity distributions demonstrated that the new system has the ability to maintain comfort conditions. Moreover, the calculated cooling load to preserve thermal comfort is much lower in the introduced method compared to the conventional system. The comparison of cooling load between the new configuration and the conventional system exhibited the energy saving potential up to 30% in the new system.

I.n. Shishkova - One of the best experts on this subject based on the ideXlab platform.

  • vapour liquid jointed solution for the evaporation Condensation Problem
    International Journal of Heat and Mass Transfer, 2019
    Co-Authors: I.n. Shishkova, A. P. Kryukov, Vladimir Yu. Levashov
    Abstract:

    Abstract In this paper, an approach for jointly solving liquid and vapour kinetic equations is presented. The particle–interface interaction characteristics are studied. Particle behaviour on the condensed-phase surface are analysed to determine the distribution functions for the evaporating molecules. Different nonsteady evaporation–Condensation Problems are solved. At this, temperatures of the condensed phase layers begin to change, as do conditions at the interface; therefore, the intensity of the evaporation changes. The processes in the liquid phase influenced the vapour density profiles. Finally, the distributions of macroparameters at different time points are obtained. The proposed approach in this paper can be used in different applications, where evaporation and Condensation processes take places, and can be applied in situations far from equilibrium conditions. Also this method can be used as a single algorithm for liquid and vapor description without special attention to liquid-vapor interface (in contrast of a molecular-kinetic approach). Evaporation and Condensation phenomena at high enough intensities are important for modern microsystems cooling technologies including liquid films. Liquid droplets evaporation gives another example of such realization. It should be noted that these processes can be observed in wide practical applications under different conditions.

  • Vapour–liquid jointed solution for the evaporation–Condensation Problem
    International Journal of Heat and Mass Transfer, 2019
    Co-Authors: I.n. Shishkova, A. P. Kryukov, Vladimir Yu. Levashov
    Abstract:

    Abstract In this paper, an approach for jointly solving liquid and vapour kinetic equations is presented. The particle–interface interaction characteristics are studied. Particle behaviour on the condensed-phase surface are analysed to determine the distribution functions for the evaporating molecules. Different nonsteady evaporation–Condensation Problems are solved. At this, temperatures of the condensed phase layers begin to change, as do conditions at the interface; therefore, the intensity of the evaporation changes. The processes in the liquid phase influenced the vapour density profiles. Finally, the distributions of macroparameters at different time points are obtained. The proposed approach in this paper can be used in different applications, where evaporation and Condensation processes take places, and can be applied in situations far from equilibrium conditions. Also this method can be used as a single algorithm for liquid and vapor description without special attention to liquid-vapor interface (in contrast of a molecular-kinetic approach). Evaporation and Condensation phenomena at high enough intensities are important for modern microsystems cooling technologies including liquid films. Liquid droplets evaporation gives another example of such realization. It should be noted that these processes can be observed in wide practical applications under different conditions.

  • Study of evaporation–Condensation Problems: From liquid through interface surface to vapor
    International Journal of Heat and Mass Transfer, 2017
    Co-Authors: I.n. Shishkova, A. P. Kryukov, V. Yu. Levashov
    Abstract:

    Abstract This paper presents a conjugate approximate method for solving transfer Problems in a two-phase (condensate–vapor) system that accounts for the peculiarities of atom–interface interactions and obtains a distribution function for the evaporated and reflected atoms. In this method, the Boltzmann kinetic equation is numerically solved for the vapor phase. The condensate matter and liquid–vapor transition layer are investigated through molecular kinetics and dense medium statistical mechanics. Finally, the proposed approach is validated by solving equilibrium saturation vapor–liquid lines of different substances as well as a nonsteady evaporation–Condensation Problem and by comparing the results with experimental data.

  • Numerical analysis of strong evaporation–Condensation through the porous matter
    International Journal of Heat and Mass Transfer, 2001
    Co-Authors: A. P. Kryukov, V. Yu. Levashov, I.n. Shishkova
    Abstract:

    Abstract Evaporation–Condensation Problem in the presence of porous body is investigated. The velocity distribution function of molecules is found from the direct numerical solution of the Boltzmann kinetic equation. New approach for calculation of the distribution function transformation as a result of gas molecules and porous body particles interactions is presented. The data of known theoretical and experimental works are compared with authors' results. Various approaches for the porous body description are discussed.