# How to get cell face temperature??

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 July 19, 2013, 14:57 How to get cell face temperature?? #1 Member   George Pichurov Join Date: Jul 2010 Posts: 39 Rep Power: 6 Hi, I need the boundary cell face temperature to use in an expression. How can I access it in the code ? For example, I can define boundary field like: Code: ``` const surfaceScalarField::GeometricBoundaryField& patchHeatFlux = heatFlux.boundaryField();``` (where heatFlux is a SurfaceScalarField entity). However, expression like T.boundaryField() ( instead of heatFlux.boundaryField() )produces an error. Why the temperature cannot have a boundary field defined like that? Ed. I am maybe heading into some sort of a solution, but I have a question. Why is the h field (probably enthalpy) recognized when adressed in the code, and T field is not? The brutal example is I can interpolate fvc::interpolate(h) and take gradient fvc::snGrad(h), but non of these with T. I am customizing the wallHeatFlux utility, by the way. Last edited by jorkolino; July 19, 2013 at 17:52.

 July 22, 2013, 04:24 #2 Member   Artem Shaklein Join Date: Feb 2010 Location: Russia, Izhevsk Posts: 43 Rep Power: 7 Hello, jorkolino. Any field type has boundaryField (bF). But as far as I know, there are different types of bF (e.g. surfaceScalarField.bF() and volScalarField.bF() are not same even on same mesh). i don't know the details of that inconsistency, but this should do the job: const volScalarField::GeometricBoundaryField& Tpatch =T.boundaryField(); The most robust choise is to use cycle (e.g. you want to make some algebraical operations with boundaryFields of vol (vf) and surfaceFields(sf)). Code: ```forAll(sf.boundaryField(), patchi) { forAll(sf.boundaryField()[patchi], facei) { sf.boundaryField()[patchi][facei] += fv.boundaryField()[patchi][facei]; } }``` But be accurate with dimensions, because type of sf.boundaryField()[patchi][facei] is scalar (or double in c++) and dimensions checking isn't done here. codder likes this.

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