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Tsuyoshi Nomura - One of the best experts on this subject based on the ideXlab platform.

  • Topology optimization for fluid–thermal interaction problems under constant Input Power
    Structural and Multidisciplinary Optimization, 2013
    Co-Authors: Tadayoshi Matsumori, Tsuguo Kondoh, Atsushi Kawamoto, Tsuyoshi Nomura
    Abstract:

    This paper deals with density-based topology optimization considering fluid and thermal interactions, in which the Navier–Stokes and heat transport equations are coupled. We particularly focus on designing heat exchangers. In the engineering context, heat exchangers are designed while considering a certain amount of Input Power. Therefore it is important to maximize the performance of a heat exchanger under a constant Input Power. In this paper we propose a way to control the Input Power by introducing an extra integral equation. To be more precise, in the fluid analysis, the inlet pressure is determined by solving the extra integral equation together with the Navier–Stokes equation. By doing this we can keep the inlet Power constant even when the flow channels are changed in the optimization process. Consequently, the system of equations of the fluid field takes an integrodifferential form. On the other hand, in the heat transport analysis, a single governing equation is defined for simultaneously modeling both the solid and fluid parts. The design variable is a fluid fraction whose distribution represents the topology of the solid and fluid domains. When designing heat exchangers, two different heat conditions are considered in the formulation of the optimization problems, namely temperature-dependent and temperature-independent heat sources. Through the numerical examples for designing flow channels in a heat exchanger, it is shown that distinct topologies can be obtained according to the Input Power and the heat source conditions.

  • topology optimization for fluid thermal interaction problems under constant Input Power
    Structural and Multidisciplinary Optimization, 2013
    Co-Authors: Tadayoshi Matsumori, Tsuguo Kondoh, Atsushi Kawamoto, Tsuyoshi Nomura
    Abstract:

    This paper deals with density-based topology optimization considering fluid and thermal interactions, in which the Navier---Stokes and heat transport equations are coupled. We particularly focus on designing heat exchangers. In the engineering context, heat exchangers are designed while considering a certain amount of Input Power. Therefore it is important to maximize the performance of a heat exchanger under a constant Input Power. In this paper we propose a way to control the Input Power by introducing an extra integral equation. To be more precise, in the fluid analysis, the inlet pressure is determined by solving the extra integral equation together with the Navier---Stokes equation. By doing this we can keep the inlet Power constant even when the flow channels are changed in the optimization process. Consequently, the system of equations of the fluid field takes an integrodifferential form. On the other hand, in the heat transport analysis, a single governing equation is defined for simultaneously modeling both the solid and fluid parts. The design variable is a fluid fraction whose distribution represents the topology of the solid and fluid domains. When designing heat exchangers, two different heat conditions are considered in the formulation of the optimization problems, namely temperature-dependent and temperature-independent heat sources. Through the numerical examples for designing flow channels in a heat exchanger, it is shown that distinct topologies can be obtained according to the Input Power and the heat source conditions.

Tadayoshi Matsumori - One of the best experts on this subject based on the ideXlab platform.

  • Topology optimization for fluid–thermal interaction problems under constant Input Power
    Structural and Multidisciplinary Optimization, 2013
    Co-Authors: Tadayoshi Matsumori, Tsuguo Kondoh, Atsushi Kawamoto, Tsuyoshi Nomura
    Abstract:

    This paper deals with density-based topology optimization considering fluid and thermal interactions, in which the Navier–Stokes and heat transport equations are coupled. We particularly focus on designing heat exchangers. In the engineering context, heat exchangers are designed while considering a certain amount of Input Power. Therefore it is important to maximize the performance of a heat exchanger under a constant Input Power. In this paper we propose a way to control the Input Power by introducing an extra integral equation. To be more precise, in the fluid analysis, the inlet pressure is determined by solving the extra integral equation together with the Navier–Stokes equation. By doing this we can keep the inlet Power constant even when the flow channels are changed in the optimization process. Consequently, the system of equations of the fluid field takes an integrodifferential form. On the other hand, in the heat transport analysis, a single governing equation is defined for simultaneously modeling both the solid and fluid parts. The design variable is a fluid fraction whose distribution represents the topology of the solid and fluid domains. When designing heat exchangers, two different heat conditions are considered in the formulation of the optimization problems, namely temperature-dependent and temperature-independent heat sources. Through the numerical examples for designing flow channels in a heat exchanger, it is shown that distinct topologies can be obtained according to the Input Power and the heat source conditions.

  • topology optimization for fluid thermal interaction problems under constant Input Power
    Structural and Multidisciplinary Optimization, 2013
    Co-Authors: Tadayoshi Matsumori, Tsuguo Kondoh, Atsushi Kawamoto, Tsuyoshi Nomura
    Abstract:

    This paper deals with density-based topology optimization considering fluid and thermal interactions, in which the Navier---Stokes and heat transport equations are coupled. We particularly focus on designing heat exchangers. In the engineering context, heat exchangers are designed while considering a certain amount of Input Power. Therefore it is important to maximize the performance of a heat exchanger under a constant Input Power. In this paper we propose a way to control the Input Power by introducing an extra integral equation. To be more precise, in the fluid analysis, the inlet pressure is determined by solving the extra integral equation together with the Navier---Stokes equation. By doing this we can keep the inlet Power constant even when the flow channels are changed in the optimization process. Consequently, the system of equations of the fluid field takes an integrodifferential form. On the other hand, in the heat transport analysis, a single governing equation is defined for simultaneously modeling both the solid and fluid parts. The design variable is a fluid fraction whose distribution represents the topology of the solid and fluid domains. When designing heat exchangers, two different heat conditions are considered in the formulation of the optimization problems, namely temperature-dependent and temperature-independent heat sources. Through the numerical examples for designing flow channels in a heat exchanger, it is shown that distinct topologies can be obtained according to the Input Power and the heat source conditions.

Halim Yanikomeroglu - One of the best experts on this subject based on the ideXlab platform.

  • On the Beamforming Optimality Range in TIMO Channels with Common and Individual Input Power Constraints
    IEEE Transactions on Communications, 2011
    Co-Authors: Saad Al-ahmadi, Halim Yanikomeroglu
    Abstract:

    In this letter, the effect of the Input Power constraint on the beamforming optimality range in Gaussian two-Input multiple-output (TIMO) channels is investigated. The obtained expressions, using standard Lagrangian formulation, determine explicitly the range of the Input signal-to-noise ratio (SNR) for which beamforming (rank-1 signaling) is optimal for TIMO channels for both the common Power constraint and the individual Power constraint cases. Moreover, the obtained results are extended to random TIMO channels, with channel state information at the receiver only, using the Jensen's upper bound on the mutual information.

  • On the role of the Input Power constraint in the beamforming optimality range in TIMO channels
    2009 11th Canadian Workshop on Information Theory, 2009
    Co-Authors: Saad Al-ahmadi, Halim Yanikomeroglu
    Abstract:

    In this paper, the effect of the Input Power constraint on the beamforming optimality range in Gaussian two-Input multiple-output (TIMO) channels is explored. The obtained results, using standard Lagrangian formulation, determine explicitly the range of the Input SNR for which rank-1 signaling (beamforming) is optimal in TIMO channels for both the common Power constraint and the individual Power constraint cases. Moreover, the obtained results are extended to random TIMO channels, with channel state information at the receiver only, using the Jensen's upper bound on the mutual information.

Atsushi Kawamoto - One of the best experts on this subject based on the ideXlab platform.

  • Topology optimization for fluid–thermal interaction problems under constant Input Power
    Structural and Multidisciplinary Optimization, 2013
    Co-Authors: Tadayoshi Matsumori, Tsuguo Kondoh, Atsushi Kawamoto, Tsuyoshi Nomura
    Abstract:

    This paper deals with density-based topology optimization considering fluid and thermal interactions, in which the Navier–Stokes and heat transport equations are coupled. We particularly focus on designing heat exchangers. In the engineering context, heat exchangers are designed while considering a certain amount of Input Power. Therefore it is important to maximize the performance of a heat exchanger under a constant Input Power. In this paper we propose a way to control the Input Power by introducing an extra integral equation. To be more precise, in the fluid analysis, the inlet pressure is determined by solving the extra integral equation together with the Navier–Stokes equation. By doing this we can keep the inlet Power constant even when the flow channels are changed in the optimization process. Consequently, the system of equations of the fluid field takes an integrodifferential form. On the other hand, in the heat transport analysis, a single governing equation is defined for simultaneously modeling both the solid and fluid parts. The design variable is a fluid fraction whose distribution represents the topology of the solid and fluid domains. When designing heat exchangers, two different heat conditions are considered in the formulation of the optimization problems, namely temperature-dependent and temperature-independent heat sources. Through the numerical examples for designing flow channels in a heat exchanger, it is shown that distinct topologies can be obtained according to the Input Power and the heat source conditions.

  • topology optimization for fluid thermal interaction problems under constant Input Power
    Structural and Multidisciplinary Optimization, 2013
    Co-Authors: Tadayoshi Matsumori, Tsuguo Kondoh, Atsushi Kawamoto, Tsuyoshi Nomura
    Abstract:

    This paper deals with density-based topology optimization considering fluid and thermal interactions, in which the Navier---Stokes and heat transport equations are coupled. We particularly focus on designing heat exchangers. In the engineering context, heat exchangers are designed while considering a certain amount of Input Power. Therefore it is important to maximize the performance of a heat exchanger under a constant Input Power. In this paper we propose a way to control the Input Power by introducing an extra integral equation. To be more precise, in the fluid analysis, the inlet pressure is determined by solving the extra integral equation together with the Navier---Stokes equation. By doing this we can keep the inlet Power constant even when the flow channels are changed in the optimization process. Consequently, the system of equations of the fluid field takes an integrodifferential form. On the other hand, in the heat transport analysis, a single governing equation is defined for simultaneously modeling both the solid and fluid parts. The design variable is a fluid fraction whose distribution represents the topology of the solid and fluid domains. When designing heat exchangers, two different heat conditions are considered in the formulation of the optimization problems, namely temperature-dependent and temperature-independent heat sources. Through the numerical examples for designing flow channels in a heat exchanger, it is shown that distinct topologies can be obtained according to the Input Power and the heat source conditions.

Tsuguo Kondoh - One of the best experts on this subject based on the ideXlab platform.

  • Topology optimization for fluid–thermal interaction problems under constant Input Power
    Structural and Multidisciplinary Optimization, 2013
    Co-Authors: Tadayoshi Matsumori, Tsuguo Kondoh, Atsushi Kawamoto, Tsuyoshi Nomura
    Abstract:

    This paper deals with density-based topology optimization considering fluid and thermal interactions, in which the Navier–Stokes and heat transport equations are coupled. We particularly focus on designing heat exchangers. In the engineering context, heat exchangers are designed while considering a certain amount of Input Power. Therefore it is important to maximize the performance of a heat exchanger under a constant Input Power. In this paper we propose a way to control the Input Power by introducing an extra integral equation. To be more precise, in the fluid analysis, the inlet pressure is determined by solving the extra integral equation together with the Navier–Stokes equation. By doing this we can keep the inlet Power constant even when the flow channels are changed in the optimization process. Consequently, the system of equations of the fluid field takes an integrodifferential form. On the other hand, in the heat transport analysis, a single governing equation is defined for simultaneously modeling both the solid and fluid parts. The design variable is a fluid fraction whose distribution represents the topology of the solid and fluid domains. When designing heat exchangers, two different heat conditions are considered in the formulation of the optimization problems, namely temperature-dependent and temperature-independent heat sources. Through the numerical examples for designing flow channels in a heat exchanger, it is shown that distinct topologies can be obtained according to the Input Power and the heat source conditions.

  • topology optimization for fluid thermal interaction problems under constant Input Power
    Structural and Multidisciplinary Optimization, 2013
    Co-Authors: Tadayoshi Matsumori, Tsuguo Kondoh, Atsushi Kawamoto, Tsuyoshi Nomura
    Abstract:

    This paper deals with density-based topology optimization considering fluid and thermal interactions, in which the Navier---Stokes and heat transport equations are coupled. We particularly focus on designing heat exchangers. In the engineering context, heat exchangers are designed while considering a certain amount of Input Power. Therefore it is important to maximize the performance of a heat exchanger under a constant Input Power. In this paper we propose a way to control the Input Power by introducing an extra integral equation. To be more precise, in the fluid analysis, the inlet pressure is determined by solving the extra integral equation together with the Navier---Stokes equation. By doing this we can keep the inlet Power constant even when the flow channels are changed in the optimization process. Consequently, the system of equations of the fluid field takes an integrodifferential form. On the other hand, in the heat transport analysis, a single governing equation is defined for simultaneously modeling both the solid and fluid parts. The design variable is a fluid fraction whose distribution represents the topology of the solid and fluid domains. When designing heat exchangers, two different heat conditions are considered in the formulation of the optimization problems, namely temperature-dependent and temperature-independent heat sources. Through the numerical examples for designing flow channels in a heat exchanger, it is shown that distinct topologies can be obtained according to the Input Power and the heat source conditions.