Coupled Dual Reciprocity Boundary Element/Finite Volume Method for Transient Conjugate Heat Transfer

Rahaim, Christopher; Kassab, Alain J.; Cavalleri, Robert

doi:10.2514/2.6506

Cited by 21 publications

(9 citation statements)

References 16 publications

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“…With the development in computational tools, other techniques such as inverse analysis using control volume heat balance [11], inverse ﬁnite‐element analysis [3, 12], and genetic algorithms [13] have been reported in the literature for prediction of surface heat flux. Very recently, a numerical technique using conjugate heat transfer (CHT) analysis has been established and is considered as one of the options to forecast the surface heat flux [14.]…”

Section: Introductionmentioning

confidence: 99%

The impact of a delay in initiating radiation therapy on prostate‐specific antigen outcome for patients with clinically localized prostate carcinoma

Nguyen

Whittington

Koo

et al. 2005

Cancer

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BACKGROUNDTo determine whether a delay in initiating external beam radiation therapy (RT) following diagnosis could impact prostate‐specific antigen (PSA) outcome for patients with localized prostate cancer, 460 patients, who received 3D conformal RT to a median dose of 70.4 Gy for clinically localized prostate cancer between 1992 and 2001, were studied.METHODSThe primary endpoint was PSA failure (American Society for Therapeutic Radiology and Oncology definition). Estimates of PSA control were made using the Kaplan–Meier method. Delay was defined as the time between diagnosis and the start of RT. Risk groups were defined based on known predictors of PSA outcome, namely, baseline PSA level, clinical T‐category, Gleason score, and percentage of biopsy cores positive for tumor. Cox multivariate regression analysis was used to determine the ability of treatment delay to predict time to PSA failure after adjusting for the other known predictors.RESULTSTreatment delay independently predicted time to PSA failure following diagnosis for high‐risk (Adjusted Hazard Ratio = 1.08 per month; P = 0.029) but not low‐risk patients (P = 0.31). Patients with high‐risk disease (n = 240) had 5‐year estimates of PSA failure‐free survival of 55% versus 39% (Plog‐rank = 0.014) for those with delay < 2.5 months versus ≥ 2.5 months respectively. The median delay was 2.5 months.CONCLUSIONSTreatment delay adversely affected PSA outcome for high‐risk patients but not for low‐risk patients following RT. Cancer 2005. © 2005 American Cancer Society.

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Section: Introductionmentioning

confidence: 99%

The impact of a delay in initiating radiation therapy on prostate‐specific antigen outcome for patients with clinically localized prostate carcinoma

Nguyen

Whittington

Koo

et al. 2005

Cancer

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“…The BEM is used to solve solid heat conduction problem. He et al [13,14], M He et al [15], Kontinos [16], Rahaim and Kassab [17] and Rahaim et al [18] adopted this conjugate heat transfer analysis method to solve different coupled problems. Kassab et al [19] reported on the coupling of the BEM method with the Glenn-HT code.…”

Section: Introductionmentioning

confidence: 98%

BEM/FDM conjugate heat transfer analysis of a two-dimensional air-cooled turbine blade boundary layer

et al. 2008

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A coupled boundary element method (BEM) and finite difference method (FDM) are applied to solve conjugate heat transfer problem of a two-dimensional air-cooled turbine blade boundary layer. A loosely coupled strategy is adopted, in which each set of field equations is solved to provide boundary conditions for the other. The Navier-Stokes equations are solved by HIT-NS code. In this code, the FDM is adopted and is used to resolve the convective heat transfer in the fluid region. The BEM code is used to resolve the conduction heat transfer in the solid region. An iterated convergence criterion is the continuity of temperature and heat flux at the fluid-solid interface. The numerical results from the BEM adopted in this paper are in good agreement with the results of analytical solution and the results of commercial code, such as Fluent 6.2. The BEM avoids the complicated mesh needed in other computation method and saves the computation time. The results prove that the BEM adopted in this paper can give the same precision in numerical results with less boundary points. Comparing the conjugate results with the numerical results of an adiabatic wall flow solution, it reveals a significant difference in the distribution of metal temperatures. The results from conjugate heat transfer analysis are more accurate and they are closer to realistic thermal environment of turbines.

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“…Several solver couplings are also dedicated to very specific configurations, with specific geometries or solvers (studies in the fields of space [11], combustion [12,13]). Besides, more and more unsteady applications can be found in the literature [5,[12][13][14][15]21].…”

Section: Introductionmentioning

confidence: 99%

Methodology of numerical coupling for transient conjugate heat transfer

Radenac¹,

Gressier²,

Millan³

2014

Computers & Fluids

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This paper deals with the construction of a conservative method for coupling a fluid mechanics solver and a heat diffusion code. This method has been designed for unsteady applications. Fluid and solid computational domains are simultaneously integrated by dedicated solvers. A coupling procedure is periodically called to compute and update the boundary conditions at the solid/fluid interface. First, the issue of general constraints for coupling methods is addressed. The concept of interpolation scheme is introduced to define the way to compute the interface conditions. Then, the case of the Finite Volume Method is thoroughly studied. The properties of stability and accuracy have been optimized to define the best coupling boundary conditions: the most robust method consists in assigning a Dirichlet condition on the fluid side of the interface and a Robin condition on the solid side. The accuracy is very dependent on the interpolation scheme. Moreover, conservativity has been specifically addressed in our methodology. This numerical property is made possible by the use of both the Finite Volume Method and the corrective method proposed in the current paper. The corrective method allows the cancellation of the possible difference between heat fluxes on the two sides of the interface. This method significantly improves accuracy in transient phases. The corrective process has also been designed to be as robust as possible. The verification of our coupling method is extensively discussed in this article: the numerical results are compared with the analytical solution of an infinite thick plate in a suddenly accelerated flow (and with the results of other coupling approaches).

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Coupled Dual Reciprocity Boundary Element/Finite Volume Method for Transient Conjugate Heat Transfer

Cited by 21 publications

References 16 publications

The impact of a delay in initiating radiation therapy on prostate‐specific antigen outcome for patients with clinically localized prostate carcinoma

The impact of a delay in initiating radiation therapy on prostate‐specific antigen outcome for patients with clinically localized prostate carcinoma

BEM/FDM conjugate heat transfer analysis of a two-dimensional air-cooled turbine blade boundary layer

Methodology of numerical coupling for transient conjugate heat transfer

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