Hey All,
Suppose I want to simulate a physical system where I have a disc-shaped heater that is producing uniform heat evenly over its area. I believe an axisymmetric simulation is the fastest way to simulate this. Is the correct way to set up this simulation to designate the heater (a line in 2D) a heat source with a constant magnitude? In reality, the heat generated varies radially (because of the changing arc length), is this taken into account by the software?
Best,
Keith
Hi Keith. Welcome.
You are correct on both points.
Thank you for the fast reply.
Just to be clear, if I make a surface that is parallel to the y-axis a heat source in an axisymmetric simulation, that is equivilent to having a disc heat source in which the heat is distributed evenly on the surface of the disc?
Thanks!
Keith
That is correct.
Anything associated with a 2D axisymmetric element (2DAE) is treated as if it is revolved around the Z axis. The elements are revolved. A "nodal" force applied to a 2DAE becomes a circular line force. A constraint at a node supports the entire circumference of the model at that radius. If you were to connect a truss element to a 2DAE, the truss element is providing a force at the node where it connects, so it is treating the truss as if it were revolved.
One thing to aware of. The analysis is usually based on the mesh being revolved 1 radian (57.296 degrees), not a full revolution. This effects any thing where the "total load" is applied to the model. Per unit area loads are not affected. For example, a force of 100 lb applied to a node is equivalent to a total of 628 lbs in the real world. (= 100 lb/radian * 2 * pi radian/revolution). A pressure of 5 psi or a heat flux of 1.25 J/s/m^2 is applied to an area which is independent of whether the area is based on 1 radian or 2pi radians.
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