This might need to be done to achieve a more consistent flow through the resistance because regions of high flow in CFD will have a lower temperature and low flow will have higher temperatures. You can also tune the resistance values to adjust the flow through the resistance material. (2) The conductivity value sometimes needs to be raised to higher values to reduce nonphysical peak temperature inside the flame volume or lower values for thermal stability. (1) If the volume is touching solid walls in multiple places you will should have very hot temperature along the walls because of the stagnant air layer where heat is also being generated. That is it, be sure to turn on radiation in the analysis settings.Do not modify by an order of a magnitude, this can have negative effects on the stiffness matrix.For a transient analysis, increase the thermal capacitance by 2-3 times.In a steady state analysis, the only property that needs to be changed would be the radiation and absorbtivity.Assign a solid material such as steel, or aluminum to the volume.The walls should be relatively thin and the opening of the tube should allow the flow of the hot gasses to pass through unrestricted.This is going to be a tube like cylinder or in the case of multiple side by side flames, a hollow rectangular tube. Generate an additional CAD volume to represent the shape of the Flame.The newer radiation model does not include radiation effects from/to resistance bodies This is turned on within the Flag Manager. Optional: If including radiation effects from the resistance material to the rest of the model the older radiation will need to be used in versions 2014-2015.It is also sensible to recess this boundary condition, to better represent the outlet where the gas is flowing
If the flame is generated from within a component (a cylinder within a chamber for instance), be sure to avoid internal boundary conditions by suppressing the part that the outlet is assigned to.Also adjust the conductivity value to a value of 10,000 W/m^2-K. (2) In CFD, assign a resistance material to this CAD generated volume with a value of 0 constant for each the flow directions (this means zero resitance).Try to have this floating in space and not against solid walls. Generate an additional CAD volume to represent the volume for the Flame Shape. Book Autodesk Combustion 4 Fundamentals Courseware Thank you enormously much for downloading autodesk combustion 4 fundamentals courseware.Maybe you have knowledge that, people have look numerous times for their favorite books bearing in mind this autodesk combustion 4 fundamentals courseware, but stop taking place in harmful downloads.It is sensible to verify the and modify the set up until the flame is properly represented. Solution: Modeling a flame for combustion models is more of a qualitative simulation and achieving reasonable flame temperature can sometimes be achieved.