Johannes Lenhard

Senior Research Fellow

PD Dr. phil. nat. Johannes Lenhard

FB Maschinenbau und Verfahrenstechnik
Lehrstuhl für Thermodynamik
Technische Universität Kaiserslautern
Erwin-Schrödinger-Straße 44
Gebäude 44/556
67663 Kaiserslautern

Tel.: +49(0)631 205-5587
Fax: +49(0)631 205-3835

E-Mail: johannes.lenhard[at]

Philosophy in Science

  • I am a philosopher and my DFG-funded research project allowes me to turn philosophy of science into philosophy in science.

  • Project: Measuring the Unmeasurable. Trust, Validation, and the Social Organization of Science

    Computer simulation has become a standard instrument in science and engineering. Simulation models help to fit theories into concrete contexts of application. These models are famous for their adjustability and can accommodate large amounts of data. The most interesting cases are those in which simulations do not merely reproduce known data or phenomena but advance into the empirically unknown where data for comparison are not available. There are many cases in which experimental evidence cannot be obtained, but models can be used for predictions. In such cases, simulation is used for what is called here “measuring the unmeasurable.” Starting from this observation, the main research questions are how simulation models are validated and how trust in them is created, maintained, and justified. The project addresses these questions in an empirical (about actual practices) and a normative sense (about justification). It is structured by three interconnected dimensions: epistemology, methodology, and institutional organization. The project leaves beaten pathways because it examines cases from the engineering sciences where models have to perform in given (not idealized) contexts and because it embeds philosophical research in science and engineering.

Studentische Arbeiten

  • Zur Zeit finden bei mir noch keine studentischen Arbeiten statt.


Zur Zeit ist bei mir leider kein Hiwi Job zu vergeben. Bei Interesse wenden Sie sich bitte an den Hiwi-Beauftragten.

Vorlesungsbetreuung / Sprechzeiten

  • Sprechzeiten

Flexibel nach Vereinbarung


  • Three recent publications

Lenhard, J. and Küster, U. (2019). "Reproducibility and the Concept of Numerical Solution", Minds and Machines, 29(1), pp. 19-36. DOI 10.1007/s11023-019-09492-9

Gramelsberger, G.; Lenhard, J; and Parker, W.S. (2019). "Philosophical Perspectives on Earth System Modeling: Truth, Adequacy, and Understanding", Journal of Advances in Modeling Earth Systems. Published online first:

Lenhard, J. (2018). "Holism or the Erosion of Modularity. A Methodological Challenge for Validation", Philosophy of Science, 85, pp.832-844.

  • Here you find a list of my publications.

CV (ausführlich hier)



Dissertation in Mathematics (University of Frankfurt)

Habilitation in Philosophy (Bielefeld University)


Associate Professor, Department of Philosophy, University of South Carolina, Columbia (academic year)

seit 01/2020

Wissenschaftlicher Mitarbeiter am Lehrstuhl für Thermodynamik (LTD), Technische Universität Kaiserslautern


Letzte Änderung: 17.01.2020