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compressible::alphatWallBoilingWallFunction: Improved solution procedure

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This boundary condition now solves for the wall temperature by interval
bisection, which should be significantly more robust than the previous
fixed-point iteration procedure. There is a new non-dimensional
"tolerance" setting that controls how tightly this solution procedure
solves the wall temperature. The "relax" setting is no longer used.

The boundary condition no longer triggers re-evaluation of the
temperature condition in order to re-calculate the heat flux within the
solution iteration. Instead, it extracts physical coefficients from the
form of the boundary condition and uses these to form a linearised
approximation of the heat flux. This is a more general approach, and
will not trigger side-effects associated with re-evaluating the
temperature condition.

The fixedMultiphaseHeatFlux condition has been replaced by a
uniformFixedMultiphaseHeatFlux condition, which constructs a mixed
constraint which portions a specified heat flux between the phases in
such a way as to keep the boundary temperature uniform across all
phases. This can be applied to all phases. It is no longer necessary to
apply a heat flux model to one "master" phase, then map the resulting
temperature to the others. An example specification of this boundary
condition is as follows:

    wall
    {
        type            uniformFixedMultiphaseHeatFlux;
        q               1000;
        relax           0.3;
        value           $internalField;
    }

The wall boiling tutorials have been updated to use these new functions,
and time-varying heat input has been used to replace the
stop-modify-restart pattern present in the single-region cases.
This commit is contained in:
Will Bainbridge
2023-01-18 12:27:10 +00:00
parent 42c35a23a8
commit 377080de52
34 changed files with 1050 additions and 781 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
applications/solvers/modules/multiphaseEuler/functionObjects/wallBoilingProperties/wallBoilingProperties.C
View File

@ -2,7 +2,7 @@
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2022 OpenFOAM Foundation
\\ / A nd | Copyright (C) 2022-2023 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -165,10 +165,8 @@ bool Foam::functionObjects::wallBoilingProperties::write()
if (isA<alphatWallBoilingWallFunction>(alphatBf[patchi]))
{
const alphatWallBoilingWallFunction& alphatw =
refCast
<
const alphatWallBoilingWallFunction
>(alphatBf[patchi]);
refCast<const alphatWallBoilingWallFunction>
(alphatBf[patchi]);
dDeparture.boundaryFieldRef()[patchi] =
alphatw.dDeparture();