[BigBoBy]

I have done a 2D simulation of a rectangular cell. I set a fixed temperature at one wall. Now I want to determine the heat flux density of this wall. To do this, I measured the heat flux of that wall [in W]. How can I now determine the heat flux density [W/m^2]? Becaus in 2D I have only one dimension of the wall because the wall is an edge.


How can ANSYS determine the heat flow of a 2D "surface" at all? Doesn't it need a 3D surface for that?

[LuckyTran]

FYI what you are calling heat flux density, everybody else calls heat flux. Heat flux has units of W/m^2 and not W.

Fluent gives you the heat flux on boundaries, it is readily available in a variable called wall heat flux. Just select it.

FVM is always a balance of fluxes going into and out of each computational cell, whether in 2D or 3D. You don't need to worry about how heat flux is obtained because it is a fundamental input to FVM. Actually, you should be more concerned with how Ansys gives you a heat in W because that does depend on an area (that you don't have)! You didn't ask how heat is calculated in a 2D simulation, but the answer is that Fluent takes the heat flux (in W/m^2) and multiplies it by the reference depth which you input in the reference values pane. You can actually get different values for heat rate in W by simply changing the value of the reference depth, but the heat flux will not change.

[Fluentlearner1]

I want to know what reference value im doing wrong cause total heat flux, is coming in 10^-12 terms, and stanton number is not showing up at all, my contours are looking good but these values are important for paper.
geometry is 2d. what should i do, tried many things, didn't work out.

[phl4nge]

You can make a mesh with one cell thick and you will get the area of ​​the wall