how to define a porous media?
 

Hi everyone I’am a new user of ansys fluent, my problem is how to define a porous media in my system.
My system is thermal energy storage in packed bed of rocks which use a hot fluid to transport energy from it to the bed of rocks in a cylinder , this operation should be done in 8 hours of the day
Thats mean that I Have to enable transient case and energy and laminar flow ,also I define water liquid as fluid , and dolomite as solid in materials, and I enable the porous media also i define temperature inlet as 350 k
When I do that, the result is a system with a fixed temperature.
Can someone help me please in resolving this problem and thank you so much :):)