In calculator of cfd post processing, we get options for average and area. How do i calculate normal and absolute velocity in cfdpost. Extracting engineering information from cfd results. Implementing the cfd basics 02 flow inside pipe simulated in ansys fluent. Create an expression for the mass weighted average outlet temperature. Area weighted or mass weighted average cfd online discussion. Request pdf flow uniformity index based on area weighted and mass weighted average velocity flow uniformity is an important index in many research fields. Tricks for producing averaged results for surfaces or. You need area weighted average of radius across the section and the flowrate of radius times tangential velocity, and flowrate of axial velocity. If you want to report the average velocity of the oulet the correct way is use areaweighted average because the velocity integral is with the areaweightes of each cell and the result is independent of the cell area distribution. Which of area weighted average or mass weighted average is. The area average velocity physically mean that the velocity profiledistributian at l 15cm from outlet, from y0 to y d is a uniform velocity, which is not true because there is boundary layers on the channel wall.
Hi, i simulate natural convection in channel,after running i want to calculate velocity of outlet and compare with experimental data, but dont know that i use of area weighted average or mass. Hi, i simulated natural convection and i want to calculate the velocity for outlet. Yes, fluent has many surface integral reports like areaweighted. I would like to get the average velocity ms for a particular region at a particular plane i have two parallel plates lying vertically at some distance with 200 mm gap. Just try to setup the custom field function or expression to get it. You can find the average value on a surface in the flow, such as average enthalpy at a velocity inlet. Area weighted average, vertex average, etc i am not sure about what report type is to be selected for monitoring flow field. Evaluation and analysis of internal flow field uniformity in grain stack. You can find the average value on a solid surface, such as the average heat flux on a heated wall with a specified temperature. Massweighted average the massweighted average of a quantity is computed by dividing the summation of the value of the selected field variable multiplied by the absolute value of the dot product of the facet area and momentum vectors by the summation of the absolute value of the dot product of the facet area and momentum vectors surface mass flux. Area weighted average of the velocity at the line is the velocity normal to area. I would like to know the average velocity in between the plates. These surfaces are sets of data points created by ansys fluent for each of.
Tricks for producing averaged results for surfaces or volumes in ansys mechanical january 12, 2017 january 11, 2017 ban banerjee tech tips ansys mechanical, average stress, postprocessing occasionally it may be a requirement to report average values of stress or strain from an ansys mechanical analysis. In ansys fluent cfd, i applied data sampling for time statistics and got time average properties. Swirl number calculation in fluent ansys student community. For incompressible flow it is physical correct to use mass average for the pressure. Contours of time average properties is shown easily. In the other case the result depend on the mesh because the integral is without the areaweighted of each cell. And this is an answer from cfdonline about the difference between them. Fluent implementation gives you the choice of three types of averaging methods. Flow uniformity index based on areaweighted and mass. The mass weighted average may be refers to derivation of velocity based on uniform time rate. How can i create a monitor for velocity at a point in fluent. Understanding pressure drop and mass average values.