🎉Community Raffle - Win $25

An exclusive raffle opportunity for active members like you! Complete your profile, answer questions and get your first accepted badge to enter the raffle.
Join and Win

Simlab Transient Heat Transfer Analysis

User: "Diogo Ferreira"
Altair Community Member
Updated by Diogo Ferreira

Hello,

 

I am studying the assembly of the brake system to evaluate the temperatures over time, of the system. I have defined inital temperatures, thermal contacts between the assembly and all the relevant heat inputs in the disc brake and the brake pads surfaces.. Now i am stuck in defining the convection loads.. If i use a constant convenction film coefficient the results are fine and admissable, but i open the option Time dependent load, and then i start filling the table points the the time and the amplitude of the load. Does this amplitude acts upon the film coefficient or upon the film temperature. I want it to act on the film coefficient and i decided to use the value 1 on the film coefficient and use the table as a scale factor. The values stoped making sense when i did that. Can anybody help me with that?

 

I am using Simlab 2019.2

 

On the image below you can se me using the film coefficient of 5e-6, because my units are W/mm^2.C for the coefficient to give correct values. In the table i used the scale factor compared to the defined value. Does that scale factor acts on the temperature or film coefficient?

<?xml version="1.0" encoding="UTF-8"?>Anota  o 2019-09-20 110303.png

Find more posts tagged with

Sort by:
1 - 4 of 41
    User: "Santhoshkumar"
    Altair Employee
    Updated by Santhoshkumar

    Hi Diogo Ferreira,

     

    Scale factor in convection table is used only for temperature. For film coefficient, it will use the constant value.

     

    Refer the below demo video for Transient heat transfer analysis from SimLab learning center.

     


     

    Let me know if you need any further help in setting up the analysis.

     

    Thanks & Regards,

    Santhoshkumar

    User: "Diogo Ferreira"
    Altair Community Member
    OP
    Updated by Diogo Ferreira

    Is there any way to do this scale factor to the coefficient? Because in my case that is changing with the car's speed. The fluid temperature is kept the same.

     

    Best regards,

     

    Diogo

    User: "Diogo Ferreira"
    Altair Community Member
    OP
    Updated by Diogo Ferreira
    User: "Rahul Rajan_21763"
    New Altair Community Member
    Updated by Rahul Rajan_21763

    Time varying convection

    Convection coefficients can be specified as time-dependent when a control node (CNTRLND) is specified on CONV card.

    The control node must be constrained by an SPCD, which is made time dependent by TLOAD1/TLOAD2. The convection coefficient is multiplied by the value from SPCD of control node.

     

    You could use Hypermesh interface to define this input.