some examples of Over constraint
conflicting BC in a same place/node/element/contact
values exceeding a particular value (problem dependant)
in your case I need to know what exactly you are simulating to give an opinion. Are you simulating Shells? if not MPC formulation is really not needed...
the physics should be the same. regardless if you simulate with thermo-electri/thermal. theoretically you should get the same temperature if the BCs are right. Try looking for possible heat paths through which your generated heat might flow away from the heat source. Now your simulation is...
Hi,
this might sound odd. But why don't you simulate using Ansys-Thermal? I simulate electrical systems for thermal investigations too. In your case I know the current value, I have the internal resistance of the body and I have the 3D model of the component. I can calculate power loss as I²R...
Hi,
I used a 2D model with thickness.
answers to your questions;
1. I am not sure why you are not able to get 'simply supported BC', but you should be able to find it in Workbench Mechanical. some other similar BCs are Fixed support and frictionless, but frictionless cannot be used on point...
Hello all,
I am starting to work with Fluent to model convection heat transfer (Natural convection) between a solid which is generating heat and a surrounding volume of air (the volume is fixed). I have tried two methods so far
1. defining these two bodies as a single part and by doing so I...
Yup, its possible. use 'deactivate step'.. fill the first three steps with some value and select those three steps (in the Tabular data section) and deactivate. Et Voilá! :)
If you still would like to simulate with those circles, use bonded contact. it will work the same way. but the previous method without cicles you might get the same results a bit faster, because its with lesser elements/computational efforts. Signs of an efficient Computational engineer ;)...
Hello,
it is a boundary condition + mesh issue. Suppress the three smaller circles inside, and use the point of contacts to define your BCs. So the vertices on the top (two) will become simply supported or no friction support. The vertice on the contact between the circle with the force will...
possible explanations, since I do not know exactly the setup.
where is the housing placed upon? it could be a metal plate or something which acts as a sink. in case of the chamber, because of the chamber's higher temperature, this contact between the housing and the placement where it is...
if it is just flux and convection load, why not try it in Ansys Thermal? It might give pretty reasonable results. with CFX your initial BCs and parameters have a greater effect on the end results.
two questions
1. in both cases which was hotter (simulation or measurement)?
2. what exactly is the potting volume? if it was suppresed to have a hollow volume, why was the internal Heat generation still given in the resistors?
Regards,
Ram
Hi, for starters read this http://www.padtinc.com/blog/the-focus/thermal-submodeling-in-ansys-workbench-mechanical-15-0, also search Ansys thermal Fins. there are couple of interesting videos on Youtube.
Cheers
yes, it is possible, heat source can be defined as either Heat Flow (W), Heat Flux (W/m²) or Internal heat generation (W/m³). If you know the heat produced due to current flow (W=I²R), you can divide this value with the volume of the heater (m³) and give the value as Internal heat generation in...
