Heat transfer simulation in an industrial journal bearing using VOF method

Taheripour, Sara; Saffarian, Mohammad Reza; Daneh-Dezfuli, Alireza

doi:10.1007/s40430-019-1751-6

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…Heat transfer is a known physical problem already modeled in many areas of knowledge (Ahmed et al, 2019;Taheripour et al, 2019). For biology, heat is inevitable when light propagates and is absorbed by biological tissues.…”

Section: Heat Transfer In Mice Brain Tissuementioning

confidence: 99%

Modeling the Effect of Temperature on Membrane Response of Light Stimulation in Optogenetically-Targeted Neurons

Peixoto

Cruz

Moulin

et al. 2020

Front. Comput. Neurosci.

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Optogenetics is revolutionizing Neuroscience, but an often neglected effect of light stimulation of the brain is the generation of heat. In extreme cases, light-generated heat kills neurons, but mild temperature changes alter neuronal function. To date, most in vivo experiments rely on light stimulation of neural tissue using fiber-coupled lasers of various wavelengths. Brain tissue is irradiated with high light power that can be deleterious to neuronal function. Furthermore, absorbed light generates heat that can lead to permanent tissue damage and affect neuronal excitability. Thus, light alone can generate effects in neuronal function that are unrelated to the genuine "optogenetic effect." In this work, we perform a theoretical analysis to investigate the effects of heat transfer in rodent brain tissue for standard optogenetic protocols. More precisely, we first use the Kubelka-Munk model for light propagation in brain tissue to observe the absorption phenomenon. Then, we model the optothermal effect considering the common laser wavelengths (473 and 593 nm) used in optogenetic experiments approaching the time/space numerical solution of Pennes' bio-heat equation with the Finite Element Method. Finally, we then modeled channelrhodopsin-2 in a single and spontaneous-firing neuron to explore the effect of heat in light stimulated neurons. We found that, at commonly used light intensities, laser radiation considerably increases the temperature in the surrounding tissue. This effect alters action potential size and shape and causes an increase in spontaneous firing frequency in a neuron model. However, the shortening of activation time constants generated by heat in the single firing neuron model produces action potential failures in response to light stimulation. We also found changes in the power spectrum density and a reduction in the time required for synchronization in an interneuron network model of gamma oscillations. Our findings indicate that light stimulation with intensities used in optogenetic experiments may affect neuronal function not only by direct excitation of light sensitive ion channels and/or pumps but also by generating heat. This approach serves as a guide to design optogenetic experiments that minimize the role of tissue heating in the experimental outcome.

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Section: Heat Transfer In Mice Brain Tissuementioning

confidence: 99%

Modeling the Effect of Temperature on Membrane Response of Light Stimulation in Optogenetically-Targeted Neurons

Peixoto

Cruz

Moulin

et al. 2020

Front. Comput. Neurosci.

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“…Currently, the main research methods for radial sliding bearings in domestic and foreign research mainly include numerical theoretical model research and computational fluid dynamics simulation research [1][2][3][4][5][6] . It is almost impossible to establish a universal theoretical numerical model for different structures of radial sliding bearings.…”

Section: Introductionmentioning

confidence: 99%

Research on characteristics of tilting pad bearing based on FLUENT-UDF simulation method

Li¹,

Zhang²

2023

Third International Conference on Mechanical Design and Simulation (MDS 2023)

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In order to solve the technical problem of large centrifugal compressors' tilting pad bearings in domestic production in China, this paper focuses on Type-one and Type-two tilting pad bearings, and proposes and uses a transient force feed back simulation technology based on FLUENT-UDF to address the low simulation efficiency issue of the general fluid-solid coupling. The operation characteristics of tilting pad bearings are studied. Through the simulation results, the possible causes of instability of the tilting pad bearings are obtained: unreasonable bearing structure and preloading, and an increased eccentricity of the journal leads to collision between the bearing and journal due to the low-pressure area between the bearing and journal. Moreover, an unreasonable bearing structure and excessive forced lubrication pressure can cause bearing deviation and collision with the journal due to the different pressure differences on both sides of the bearing.

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“…With the maturity of computer technology, simulation technology has been further popularized through simulation software. Now, simulation technology has been widely used in stage performance (Bilbao, 2009;Niedenthal et al, 2010;Jaber et al, 2019), event scheduling (Colella, 2011;Arima, 2015), emergency response (Merién et al, 2010), military training (Liang et al, 2001;Machado et al, 2015;Ma et al, 2016), aerospace (Zipfel and Schiehlen, 2001;Jha et al, 2015), industrial manufacturing (Buyya and Murshed, 2010;Yamaguchi et al, 2016;Santipanusopon and Worawattanaparinya, 2019;Taheripour et al, 2019), technology research and development (Boyd and Bruns, 2001;Rapaport et al, 2002;IEEE, 2010;Binder and Heermann, 2014;Moin, 2018;Yingying et al, 2018), and many other fields. The simulation process has many commonalities, and these commonalities can be found in the application of simulation technology in various fields (Bucklew, 2010).…”

Section: Introductionmentioning

confidence: 99%

Quantum-Based Creative Generation Method for a Dancing Robot

et al. 2020

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In this paper, we propose a creative generation process model based on the quantum modeling simulation method. This model is mainly aimed at generating the running trajectory of a dancing robot and the execution plan of the dancing action. First, we used digital twin technology to establish data mapping between the robot and the computer simulation environment to realize intelligent controllability of the robot's trajectory and the dance movements described in this paper. Second, we conducted many experiments and carried out a lot of research into information retrieval, information fidelity, and result evaluation. We constructed a multilevel three-dimensional spatial quantum knowledge map (M-3DQKG) based on the coherence and entangled states of quantum modeling and simulation. Combined with dance videos, we used regions with convolutional neural networks (R-CNNs) to extract character bones and movement features to form a movement library. We used M-3DQKG to quickly retrieve information from the knowledge base, action library, and database, and then the system generated action models through a holistically nested edge detection (HED) network. The system then rendered scenes that matched the actions through generative adversarial networks (GANs). Finally, the scene and dance movements were integrated, and the creative generation process was completed. This paper also proposes the creativity generation coefficient as a means of evaluating the results of the creative process, combined with artificial brain electroenchalographic data to assist in evaluating the degree of agreement between creativity and needs. This paper aims to realize the automation and intelligence of the creative generation process and improve the creative generation effect and usability of dance movements. Experiments show that this paper has significantly improved the efficiency of knowledge retrieval and the accuracy of knowledge acquisition, and can generate unique and practical dance moves. The robot's trajectory is novel and changeable, and can meet the needs of dance performances in different scenes. The creative generation process of dancing robots combined with deep learning and quantum technology is a required field for future development, and could provide a considerable boost to the progress of human society.

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Heat transfer simulation in an industrial journal bearing using VOF method

Cited by 5 publications

References 20 publications

Modeling the Effect of Temperature on Membrane Response of Light Stimulation in Optogenetically-Targeted Neurons

Modeling the Effect of Temperature on Membrane Response of Light Stimulation in Optogenetically-Targeted Neurons

Research on characteristics of tilting pad bearing based on FLUENT-UDF simulation method

Quantum-Based Creative Generation Method for a Dancing Robot

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