Learning Forum

[roytorc]

Hi,

I am modelling the turbulent non-premixed flame touching the adiabatic surface (by set heat flux of the wall =0 in thermal boundary condition). However, there is a temperature gradient near the wall which I don't understand how is that possible. I've checked the heat flux across the boundary and it is 0. Please advise.

 

[DrAmine]

Check temperature of the wall and near wall cell temperature

[roytorc]

After checked, the values are:

wall --> Contour level 6, value in [820.98102, 907.81116].

 

 

near wall cell --> Contour level 10, value in [1168.3018, 1255.1318].

 

I still don't understand why there is the temperature gradient. Please help advise.

[DrAmine]

No on the wall check the wall temperature then on the same wall the cell temperature.

[roytorc]

I checked for wall temperature and adjacent wall temperature from the contour plot, is it the right way to check?

If so, wall temp = [973.76892, 984.96167]

adjacent wall temp = [1097.0457, 1105.3676]

Why is this situation occur?

 

[DrAmine]

That is not ideal so. You need to quantify it in better way. Either you use UDF or plot along the line wall and static temperature.

[DrAmine]

Or look after the gradients which you enable under solve set expert.

[roytorc]

Is this mean Fluent assign some temperature value to the adiabatic wall? By the way, I cannot see the gradient option in sove>set>expert

 

[DrAmine]

Keep temporary... to yes to see gradients for Post processing