TY - JOUR T1 - Reduction of numerical viscosity in FFD model JF - Engineering Applications of Computational Fluid Mechanics Y1 - 2012 A1 - Wangda Zuo A1 - Mingang Jin A1 - Qingyan Chen VL - 6 IS - 2 ER - TY - Generic T1 - Validation of three dimensional fast fluid dynamics for indoor airflow simulations T2 - the 2nd International Conference on Building Energy and Environment (COBEE2012) Y1 - 2012 A1 - Mingang Jin A1 - Wangda Zuo A1 - Qingyan Chen JF - the 2nd International Conference on Building Energy and Environment (COBEE2012) CY - Boulder, CO ER - TY - Generic T1 - Validation of a Fast-Fluid-Dynamics Model for Predicting Distribution of Particles with Low Stokes Number T2 - 12th International Conference on Indoor Air Quality and Climate (Indoor Air 2011) Y1 - 2011 A1 - Wangda Zuo A1 - Qingyan Chen KW - cfd KW - ffd KW - low stokes number KW - particle transportation AB - To design a healthy indoor environment, it is important to study airborne particle distribution indoors. As an intermediate model between multizone models and computational fluid dynamics (CFD), a fast fluid dynamics (FFD) model can be used to provide temporal and spatial information of particle dispersion in real time. This study evaluated the accuracy of the FFD for predicting transportation of particles with low Stokes number in a duct and in a room with mixed convection. The evaluation was to compare the numerical results calculated by the FFD with the corresponding experimental data and the results obtained by the CFD. The comparison showed that the FFD could capture major pattern of particle dispersion, which is missed in models with well-mixed assumptions. Although the FFD was less accurate than the CFD partially due to its simplification in numeric schemes, it was 53 times faster than the CFD. JF - 12th International Conference on Indoor Air Quality and Climate (Indoor Air 2011) CY - Austin, Texas ER - TY - JOUR T1 - Fast and informative flow simulation in a building by using fast fluid dynamics model on graphics processing unit JF - Building and Environment Y1 - 2010 A1 - Wangda Zuo A1 - Qingyan Chen VL - 45 IS - 3 ER - TY - Generic T1 - Fast simulation of smoke transport in buildings T2 - the 41st International HVAC&R congress Y1 - 2010 A1 - Wangda Zuo A1 - Qingyan Chen JF - the 41st International HVAC&R congress CY - Beograd, Serbian ER - TY - Generic T1 - Impact of time-splitting schemes on the accuracy of FFD simulations T2 - the 7th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2010) Y1 - 2010 A1 - Jianjun Hu A1 - Wangda Zuo A1 - Qingyan Chen JF - the 7th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2010) CY - Syracuse, NY ER - TY - JOUR T1 - Improvements on FFD modeling by using different numerical schemes JF - Numerical Heat Transfer, Part B Fundamentals Y1 - 2010 A1 - Wangda Zuo A1 - Jianjun Hu A1 - Qingyan Chen VL - 58 IS - 1 ER - TY - Generic T1 - Improvements on the fast fluid dynamics model for indoor airflow simulation T2 - the 4th National Conference of IBPSA-USA (SimBuild2010) Y1 - 2010 A1 - Wangda Zuo A1 - Qingyan Chen JF - the 4th National Conference of IBPSA-USA (SimBuild2010) CY - New York, NY ER - TY - JOUR T1 - Simulations of air distribution in buildings by FFD on GPU JF - HVAC&R Research Y1 - 2010 A1 - Wangda Zuo A1 - Qingyan Chen VL - 16 IS - 6 ER - TY - Generic T1 - Fast parallelized flow simulations on graphic processing units T2 - the 11th International Conference on Air Distribution in Rooms (RoomVent 2009) Y1 - 2009 A1 - Wangda Zuo A1 - Qingyan Chen JF - the 11th International Conference on Air Distribution in Rooms (RoomVent 2009) CY - Busan, Korea ER - TY - Generic T1 - High performance computing for indoor air T2 - 11th International IBPSA Conference (Building Simulation 2009) Y1 - 2009 A1 - Wangda Zuo A1 - Qingyan Chen JF - 11th International IBPSA Conference (Building Simulation 2009) CY - Glasgow, U.K. ER - TY - JOUR T1 - Real time or faster-than-real-time simulation of airflow in buildings JF - Indoor Air Y1 - 2009 A1 - Wangda Zuo A1 - Qingyan Chen VL - 19 IS - 1 ER - TY - Generic T1 - Computational fluid dynamics for indoor environment modeling: past, present, and future T2 - the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007) Y1 - 2007 A1 - Qingyan Chen A1 - Zhao Zhang A1 - Wangda Zuo JF - the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007) CY - Sendai, Japan ER - TY - Generic T1 - Real time airflow simulation in buildings T2 - the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007) Y1 - 2007 A1 - Wangda Zuo A1 - Qingyan Chen JF - the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007) CY - Sendai, Japan ER - TY - Generic T1 - Validation of fast fluid dynamics for room airflow T2 - the 10th International IBPSA Conference (Building Simulation 2007) Y1 - 2007 A1 - Wangda Zuo A1 - Qingyan Chen JF - the 10th International IBPSA Conference (Building Simulation 2007) CY - Beijing, China ER - TY - JOUR T1 - Framework for Coupling Room Air Models to Heat Balance Model Load and Energy Calculations (RP-1222) JF - HVAC&R Research (ASHRAE) Y1 - 2004 A1 - Brent T. Griffith A1 - Qingyan Chen VL - 10 IS - 2 ER - TY - JOUR T1 - On Approaches to Couple Energy Simulation and Computational Fluid Dynamics Programs JF - Building and Environment Y1 - 2002 A1 - Zhiqiang Zhai A1 - Qingyan Chen A1 - Philip Haves A1 - Joseph H. Klems AB -

Energy simulation (ES) and computational fluid dynamics (CFD) can play important roles in building design by providing complementary information about the buildings' environmental performance. However, separate applications of ES and CFD are usually unable to give an accurate prediction of building performance due to the assumptions involved in the separate calculations. Integration of ES and CFD eliminates many of these assumptions since the information provided by the models is complementary. Several different approaches to integrating ES and CFD are described. In order to bridge the discontinuities of time-scale, spatial resolution and computing speed between ES and CFD programs, a staged coupling strategy for different problems is proposed. The paper illustrates a typical dynamic coupling process by means of an example implemented using the EnergyPlus and MIT-CFD programs.

VL - 37 ER - TY - CONF T1 - Strategies for Coupling Energy Simulation Programs and Computational Fluid Dynamics Programs T2 - Building Sim 2001 Y1 - 2001 A1 - Zhiqiang Zhai A1 - Qingyan Chen A1 - Joseph H. Klems A1 - Philip Haves AB -

Energy simulation (ES) and computational fluid dynamics (CFD) can play important roles in building design by providing complementary information about the buildings' environmental performance. However, separate applications of ES and CFD are usually unable to give an accurate prediction of building performance due to the assumptions involved in the separate calculations. Integration of ES and CFD eliminates many of these assumptions since the information provided by the models is complementary. Several different approaches to integrating ES and CFD are described. In order to bridge the discontinuities of time-scale, spatial resolution and computing speed between ES and CFD programs, a staged coupling strategy for different problems is proposed. The paper illustrates a typical dynamic coupling process by means of an example implemented using the EnergyPlus and MIT-CFD programs.

JF - Building Sim 2001 CY - Rio de Janeiro, Brazil VL - 1 U1 -

Simulation Research Group

U2 - LBNL-48286 ER - TY - Generic T1 - Better IAQ Through Integrating Design Tools For The HVAC Industry T2 - Healthy Buildings 2000 Y1 - 2000 A1 - Tuomas Laine A1 - Risto Kosonen A1 - Kim Hagström A1 - Panu Mustakallio A1 - De-Wei Yin A1 - Philip Haves A1 - Qingyan Chen AB -

There is currently no effective combination of interoperable design tools to cover all critical aspects of the HVAC design process. Existing design tools are separately available, but require expertise and operating time that is beyond the scope of a normal design project. For example, energy analysis and computational fluid dynamics (CFD) tools are not used in practical design, leading to poor indoor air quality and/or unnecessary energy consumption in buildings.

A prototype integrated software tool for demonstration, process mapping and proof-of-concept purposes was developed under a new international, Finland/USA jointly funded development project BildIT. Individual design tools were simplified and adapted to specific applications and also integrated so that they can be used in a timely and effective manner by the designer. The core of the prototype linked together an architectural CAD system, a 3D space model, a CFD program and a building energy simulation program and it utilises real product data from manufacturer's software. Also the complex building design, construction, maintenance and retrofit processes were mapped to get a template for the structure of the integrated design tool.

JF - Healthy Buildings 2000 CY - Espoo, Finland U2 - LBNL-48456 ER -