Abdul Nassar’s Post

CFD approach to turbulence: the #CFD (Computational Fluid Dynamics) approach to turbulence involves modeling and simulating turbulent flow phenomena using numerical methods. Turbulence in fluid flow refers to the chaotic, irregular motion characterized by fluctuations in velocity, pressure, and other flow properties. To handle turbulence in CFD simulations, various turbulence models are employed. https://lnkd.in/gqWPQ-sV

I love CFD! Ignition of liquid rocket engines is a challenging problem. One of several ignition methods is a torch ignitor, where hot combustion products are injected into a stream of reactants. Failure to ignite or flashback can occur when the flow rates are too low, and if flow is injected too late, pressure surges or detonation waves can destroy a combustor. Here we model torch ignition of a subcritical liquid-oxygen single element liquid rocket combustor with CONVERGE CFD. Detailed chemistry, large eddy simulation, and adaptive mesh refinement are used to efficiently model this complex process. How cool is this? Thanks to David Rowinski for providing this case. 🚀 🔥 #cfd #convergecfd

Experimental Study and CFD Modelling of Down-Reaching Flame Behaviors of Tank Fires with Large Ullage Heights https://lnkd.in/g97nvjeX

Unlocking the Complexities of Cyclone Separators with CFD Visualization 🌪️ I'm excited to share a snapshot from my recent Computational Fluid Dynamics (CFD) simulation, visualizing the Q-criterion within a High Efficiency Stairmand Cyclone (1951). This model is crucial for understanding the vortex structures and flow dynamics inside the cyclone separator, which is essential for optimizing its performance in industrial applications. As you can see, the flow tends to reach a established regime after a moment, which is critical for analyzing the efficiency and stability of the cyclone separator. In the video, you’ll see how the Q-criterion highlights regions of rotational flow, helping us to better understand turbulence and improve efficiency in separation processes. PS: Have fun with increasing the playback speed! #CFD #FluidDynamics #Engineering #CycloneSeparator #QCriterion #Simulation #StairmandCyclone

Recently completed a course on computational fluid dynamics which performed a simulation using the cloud-based simulation tool SimScale. A pump simulation was carried out to learn the fundamentals of CFD.

In a previous post, I showed the beveled supersonic nozzle. If you want to use it in a Laser Wakefield Acceleration experiment, remember that if the bevel position is chosen properly, the beveled nozzle can generate an interesting gas density profile with a flat top profile and long gas density ramp. This profile might be suitable if we want to match the electron beam emittance from one stage to the next stage or accelerator element. I did a fast CFD simulation to check it. Here are the results.

🚀 New YouTube CFD Video Alert! 🎥 I just uploaded a new video on YouTube discussing the staggered and collocated grid approaches in computational fluid dynamics (CFD). Whether you're a student, researcher, or professional in the field of fluid dynamics, this video will help you understand the advantages and challenges of each method. 🔍 What you'll learn: Differences between staggered and collocated grids Applications and benefits of each approach 👉 Don't forget to subscribe to my channel for more educational content on CFD and other related topics! 🔄 Share this post with your network if you find it helpful. #CFD #FluidDynamics #ComputationalFluidDynamics #Engineering #Education #YouTube #Subscribe https://lnkd.in/dhM-53pN

Dear friends, We have made the extended abstract of our tool for heat treatment of titanium components available online (#NAFEMS, Multiphysics Conference 2023, Munich).  https://lnkd.in/dn4ecZ6H #𝐎𝐩𝐞𝐧𝐅𝐎𝐀𝐌 was used to model the cooling in quiescent air and in a cooling chamber with forced convection in a 𝐭𝐫𝐚𝐧𝐬𝐢𝐞𝐧𝐭 𝐂𝐇𝐓 𝐚𝐧𝐚𝐥𝐲𝐬𝐢𝐬, taking into account  𝐫𝐚𝐝𝐢𝐚𝐭𝐢𝐨𝐧,  𝐜𝐨𝐧𝐯𝐞𝐜𝐭𝐢𝐨𝐧,  𝐜𝐨𝐧𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐚𝐧𝐝  𝐞𝐧𝐞𝐫𝐠𝐲 𝐫𝐞𝐥𝐞𝐚𝐬𝐞 𝐝𝐮𝐞 𝐭𝐨 𝐦𝐢𝐜𝐫𝐨𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐚𝐥 𝐭𝐫𝐚𝐧𝐬𝐟𝐨𝐫𝐦𝐚𝐭𝐢𝐨𝐧.  The transient temperature field in the titanium region was mapped to #𝐀𝐛𝐚𝐪𝐮𝐬 𝐟𝐨𝐫 𝐜𝐫𝐞𝐞𝐩 𝐚𝐧𝐚𝐥𝐲𝐬𝐢𝐬. We achieved good agreement with the experimental temperature curves and cooling rates. The CFD process with set-up, meshing and simulation is 𝐟𝐮𝐥𝐥𝐲 𝐚𝐮𝐭𝐨𝐦𝐚𝐭𝐞𝐝. The 𝐂𝐅𝐃 𝐭𝐨𝐨𝐥 is used by our partner the company Otto Fuchs to design the cooling conditions in development. Enjoy Ulrich #CHT #CFDDesignTool

Duct Flow CFD simulation in STAR-CCM+.https://lnkd.in/du4yY-Dt

Meshing the aorta geometry is a critical step in conducting CFD simulations. This paper highlights the balance between meshing time and accuracy, emphasizing the selection of an appropriate mesh element size for the aorta geometry. #Bioengineering MDPI