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How to select a node in space to give ambient temperature (Linear Steady State Heat Transfer)?

I am trying linear steady state heat transfer problem on a heat sink. I have given the temperature constraint to bottom of the heatsink, I have attached the hm file below. I am trying to select a node by id in constraints panel to give ambient temperature, but the node is not getting selected. Convection interface is all the faces except bottom face. I am trying to select a node in space not on the heatsink model. Please provide a solution on how to select a node in space for this problem statement or any other object? Mesh Quality Check is neglected.

Heatsink.hm

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OptiStruct

v2020.1

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Adriano_Koga

do you have already a temp node for this reference temperature?

you can create a node and create your spc wherever you want for this, and then select this node as your ambient tmperature node.

Ajay_22186

do you have already a temp node for this reference temperature?

you can create a node and create your spc wherever you want for this, and then select this node as your ambient tmperature node.

I didn't create any temp node, should I create one?

Also I want to give the ambient temperature to side faces of the heatsink, can it be given directly without creating a temp node or is it mandatory to create a temp node and then proceed further?

Adriano_Koga

I didn't create any temp node, should I create one?

Also I want to give the ambient temperature to side faces of the heatsink, can it be given directly without creating a temp node or is it mandatory to create a temp node and then proceed further?

fot ambient temperature, you need to assign the ambient temperature to some node or scalar point. Usually these are created as temp nodes that you then assign a temperature and link to your convection model (in this case the convection face associated to the side faces of the heatsink).