I want to simulate a fire with sorent.f and sorsca.f,but meet some problems. The temprature distribution is only in a small zone.I don't know how to assign the values of aditionnal scalars?I hope someone can help me out!

Can you elaborate a bit more? Are you asking how use sorsca.f for different scalars? Or how to limit the use to a defined zone?

First of all,thank you ,Sheila.I mean that the somke should spread more extendly.But, now it spreads only in a small zone.Maybe,it depents on the parameters of definded scalar,such as heat format, density,and so on.By the way,can you suggest me another method for fire simulation?

Is that just the color scale? Set the color scale manually in a reasonable range. You will get another brilliant pic~!

Thank you! I'm afraid not about color scale.I define an additional scalar as smoke.There are some values need to assign for property.Can someone tell me the meaning of expansion coefficient and heat of formation.how to assign their value? Thanks!