pressure gradient
 

hello dear

I simulate an axisymmetric flow in a tube with dynamic wall motion. I want to calculate the pressure gradient along the tube but when I use dp/dx in xy plot, it shows me a horizontal line with zero value like the attached image

so:

Does anyone know how I can calculate the pressure gradient in fluent?

pressure gradient is zero
 

hello


in this case, go to Solve then iterate then click on iterate only once wait one moment then to see the graph



regard

hello

Thanks for your answer, your answer is good but it's good to know in fluent for plot any variable gradient you must save the value of that variable.
in general fluent doesn't save any gradient so you can't plot any variable gradient such as temperature pressure or velocity.
so u must change the setting