# M_Kintsch

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1. ## RADIATION and time scaling

okay the Solution of the Problem is realy easy. the emission hast to be a value between 0 and 1, but you can define values greater than 1. So for example if you want to speed up your thermal calculation by a factor of 10 you just need to scale your emission factor. e (with out scaling) = 0.6 e (with sclaing by 10) =6.0 works absolut fine. If you want to solve radiation problems use the newest Radioss version (2017.2), with older version i had extrem deviations to the real temperature values! With best regards Kintsch
2. ## RADIATION and time scaling

I don't think this will work, a little example: Convection: Q=h_conv*(T_1-T_2) with time scaling by 10 i just go to the h_conv value and scal it with the same value h_conv=yy*10 Radiation: Q=e*Boltzman_const*(T_1^4-T_2^4) e = has to be a value between 0 and 1 .. so i don't have the possibility to scale this value over the emissionfactor With the Time vs Temperature i only can scale an constant value, because T_1 is my sourounding Temperature and it is const. 303,15K. With best regards Kintsch
3. ## RADIATION and time scaling

Hello, i have a little question about the possibility of time scaling and the use of the radiation load collector. I used the factor 10 (1sec in simulation=10sec in real time) to speed up my thermal analysis with radioss. It works fine wenn i scale thermal conductivity and the heat transfer coefficent (for example convection) by the factor i used for speed up (10). Is this although possible for the radiation? Because i don't see any way to scale this value in correct way... With best regards Kintsch
4. ## Temperature dependent specific heat, thermal conductivity and heat transfer coefficient

Is there any update on the materialcards? Because i don't see any temperature dependet specific heat capacity cards for Mat4 in optistruct?
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