TAGGED: absolute-pressure, contour-pressure, fluid, total-pressure
April 5, 2023 at 2:32 pmpv00170Subscriber
Does Report definition > Force report > Drag > Drag force give the force of static pressures?
April 7, 2023 at 6:36 amNikhil NaraleAnsys Employee
The drag force is calculated by integrating pressure over an object's surface. Bernoulli's principle dictates that pressure and velocity vary along a streamline to preserve total pressure. This results in the dynamic head (velocity) becoming zero at the surface of an obstacle, and hence static pressure becomes dominant. With that said, the drag force also keeps the viscous forces into account in addition to the static pressure distribution.
April 7, 2023 at 7:48 ampv00170Subscriber
Yes, I understand that if the object's surface is a no-slip boundary, velocity is zero at the surface, and therefore dynamic pressures become zero, leading total pressure be equal to static pressure.
I did an analysis of water pressures in a bridge, and the following image is refeering to the pressures and forces of the upper part of the slab. I obtained the static, dynamic and total pressures of the upper part of the slab, and I can see that dynamic pressures are far from 0. I did the integral of pressures and I got the forces in (N) which can be seen in the left-hand side of the image.
At the same time, values for static, dynamic and total forces are the same as if I use Surface report > Area weighted average > Static pressure, dynamic pressure and total pressure, respectively.
On the right hand side of the image the Report definition > Lift force, gives me the same exact value as the static force computed by myself and by Surface report.
April 21, 2023 at 2:59 pmpv00170Subscriber
Dear Nikhil, any update?
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Suppress Fluent to open with GUI while performing in journal file
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Getting graph and tabular data from result in workbench mechanical
- Difference between K-epsilon and K-omega Turbulence Model
- The solver failed with a non-zero exit code of : 2
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error: Received signal SIGSEGV
© 2023 Copyright ANSYS, Inc. All rights reserved.