Turbulent Navier-Stokes Simulations of Heat Transfer with Complex Wall Temperature Variations

Marineau, Eric C.; Schetz, Joseph A.; Neel, Reece

doi:10.2514/6.2006-3087

Cited by 11 publications

(15 citation statements)

References 15 publications

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“…Con el aumento en el desarrollo de la capacidad de computo, las soluciones numéricas de las ecuaciones de Navier-Stokes usando CFD consiguieron ser más precisas. En [15] se acopla la solución térmica de CFD aplicada al fluido con los fenomenos de condución de calor de un cuerpo isotrópico, obtiendo así una solución más adecuada.…”

Section: B Estado Del Arteunclassified

Modelación de la distribución térmica en una tobera convergente-divergente utilizada en sistemas aeroespaciales

Alvarez-Montoya¹,

Sierra²,

Navia³

et al. 2019

Proceedings of the 17th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Industry, Innovation

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A numerical mathematical model was developed to determine the behavior of thermal distribution in a convergentdivergent nozzle used in aerospace applications. This development was carried out by using the two-dimensional heat equation for describing the phenomenon, which was resolved by means of the finite difference method. In addition, it was considered insulated and flow boundary conditions, a structured mesh with, and a nodal density of 169. The methodology was implemented in MATLAB through an algorithm which allows variations in the geometry, nodal density, and inlet conditions. This methodology was validated using computational fluid dynamics (CFD). The validation demonstrated that the proposed methodology reduces the computational cost by having an execution time 1555 times less than CFD simulation time. The relative error between the methodology and the CFD results was 2,9 %. The proposed methodology would allow the preliminary design process of this type of nozzles by analyzing thermal distribution effectively and accurately.

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Section: B Estado Del Arteunclassified

Modelación de la distribución térmica en una tobera convergente-divergente utilizada en sistemas aeroespaciales

Alvarez-Montoya¹,

Sierra²,

Navia³

et al. 2019

Proceedings of the 17th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Industry, Innovation

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“…The detailed geometry and operating condition are available in Ref. [27,28]. The temperature distribution for the outer wall of the nozzle measured during the experiment is shown in Fig.…”

Section: Conjugate Nozzle Flowmentioning

confidence: 99%

“…This case of conjugate nozzle flow has previously been simulated by Marineau et al [28] and Liu et al [29]. The wall material was not specified by Back et al [26], however the thermal conductivity of the material, λ s , can be determined from the temperature gradient and the heat flux provided by Back et al [26].…”

Section: Conjugate Nozzle Flowmentioning

confidence: 99%

A fluid-structure-thermal model for bump-type foil thrust bearings

Qin

Jacobs

Keep

et al. 2018

Tribology International

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Please cite this article as: Qin K, Jacobs PA, Keep JA, Li D, Jahn IH, A fluid-structure-thermal model for bump-type foil thrust bearings, Tribology International (2018),• Implementation of a computational framework for fluid-structure-thermal simulations.• The fluid-thermal coupling is validated.• A third of the generated heat is advected with the fluid in the CO2 case, compared to only 3% for the air case.• Heat transfer to the stator is similar for both air and CO2 cases. AbstractThis paper presents a multi-physics multi-timescale computational framework for the three-dimensional and two-way coupled fluid-structure-thermal simulation of foil thrust bearings. Individual solvers for the transient fluid flow, structural deformation, heat conduction and the coupling strategy are discussed. Next, heat transfer models of the solid structures within foil thrust bearings are also described in detail. The result is a multi-physics computational framework that can predict the steady state and dynamic performance of foil thrust bearings. Numerical simulations of foil thrust bearings with air and CO 2 are then performed. It is found that the centrifugal pumping that naturally occurs in CO 2 bearings due to the high fluid density provides a new and effective cooling mechanism for the CO 2 bearing.

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“…NUMERICAL ALGORITHM Figure 5.5: Schematic of the conjugate heat transfer problem coupled using the matching condition (Eq. 5.2) [44]. In the following description, it may be helpful to refer to Fig.…”

Section: Numerical Algorithmmentioning

confidence: 99%

Computational and Experimental Investigation of Supersonic Convection over a Laser-Heated Target

Marineau

Schetz

Neel

2009

Journal of Thermophysics and Heat Transfer

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This research concerns the development and validation of simulation of the beam-target interaction to determine the target temperature distribution as a function of time for a given target geometry, surface radiation intensity and free stream flow condition. The effect of a turbulent supersonic flow was investigated both numerically and experimentally.Experiments were in the Virginia Tech supersonic wind tunnel with a Mach 4 nozzle, ambient total temperature, total pressure of 160 psi and Reynolds number of 5 × 10 7 /m . The target consisted of a 6.35 mm stainless steel plate painted flat black. The target was irradiated with a 300 Watt continuous beam Ytterbium fiber laser generating a 4 mm Gaussian beam at 1.08 micron 10 cm from the leading edge where a 4 mm turbulent boundary layer prevailed. An absorbed laser power of 65, 81, 101, 120 Watts was used leading to a maximum heat flux between 1035 to 1910 W/cm 2 . The target surface and backside temperature was measured using a mid-wave infrared camera. The backside temperature was also measured using eight type-K thermocouples.Two tests are made, one with the flow-on and the other with the flow-off. For the flow-on case, the laser is turned on after the tunnel starts and the flow reaches a steady state. For the flow-off case, the plate is heated at the same power but without the supersonic flow. The cooling effect is seen by subtracting the flow-off temperature from the flow-on temperature. This temperature subtraction is useful in cancelling the bias errors such that the overall uncertainty is significantly reduced.A new conjugate heat transfer algorithm was implemented in the GASP solver and validated by predicting the temperature distribution inside a cooled nozzle wall. The conjugate heat transfer algorithm was used to simulate the experiments at 81 and 65 Watts. Most computations were performed using the Spalart-Allmaras turbulence model on a 280, 320 cell grid. A grid convergence study was performed.At 65 Watts, good agreement was found in the predicted surface and backside temperature. On the surface, cooling was underpredicted close to the center and better agreement was seen away form the center. On the backside, good agreement was found for the temperature and temperature difference. Compared to the 65 Watt case, the 81 Watt case displays more asymmetry and a region of increased cooling is found upstream. The increased asymmetry was also seen on the backside by both the thermocouple and infrared temperature measurements. The computation underpredicts the surface temperature by 7% for the flow-off case. Again, cooling is underpredicted at the surface near the center. For all power settings, convective cooling significantly increases the time required to reach a given temperature.

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Turbulent Navier-Stokes Simulations of Heat Transfer with Complex Wall Temperature Variations

Cited by 11 publications

References 15 publications

Modelación de la distribución térmica en una tobera convergente-divergente utilizada en sistemas aeroespaciales

Modelación de la distribución térmica en una tobera convergente-divergente utilizada en sistemas aeroespaciales

A fluid-structure-thermal model for bump-type foil thrust bearings

Computational and Experimental Investigation of Supersonic Convection over a Laser-Heated Target

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