Concrete block under thermal load

Dear all,

I am new to abaqus and trying to analyze the thermal analysis on a concrete block of size 0.15 x 0.15 x 0.15.

The surface heat flux of magnitude 100 that I am giving is only from one side and NOT having any boundary conditions.

If I choose steady state condition then I get an error as "Time increment required is less than the minimum specified".

Also I cannot define time period. I want the nodal temperature of concrete subjected to thermal load from one side for 24 hours of heating at 100oC.

Please help!