I make calculation of my model of finned heat exchangers by Ansys Fluent. Model is somewhat complicated and have abut 5 millions elements and 8 inflation's layers. I chose k-epsilon method for solving and choose pressure outlet and velocity inlet for air (1 m/s).
On outlet is appeared reversible flow on great amount (see atachment). What is reason?
How to eliminate this reversibilke flow?
Did i make some mistake in input data?
Hi, Vigneshwaran
Here is BC. Because of different temperature profile on outlet there is different air density and probably ocuaring lifting efect. This lead to different pressure profile and reverse flow. But still I am suprised for amount of this reversed flow.
steady, hybrid, operating pressure is 1 atm, number of cell total is about 1400 (as I remember started with less than 800 cell) ... right now I am not at computer
OK, thanks.
Additionaly I will try to improve mesh with controling mesh method.
reverse flow or reversible flow?
Is your 2nd figure the whole computational domain, i.r., the right-most boundary the computational boundary?
Did you check the streamline or velocity vector?
Mr. Shiuh-Hwa Shyu
Fig. is whole computional domain. Velocity is accordance with picture.
I thought the contour is for temperature. PLease look at the velocity vector as well as streamline to make sure that you see a reverse flow
I will bring my past experience. Reversible flow at the outlet in my example occurs in unstructuredmesh regardless of the size of the element.
When I changed the mesh in a structured form (HEX mesh on oulet part of HE) reversible flow at the outlet is disappeared, and the result in terms of temperature is different (which can not be ignored ?? !!).
Interesting. It seems to me that it has something to do with how fluent handle the outlet bc.
How can i calculate the hydraulic diameter of channel just like this to find the reynolds no. ?
- Badges
- Science topic